travis: use slim generic image, and some fixups

Now that caches are distinct (https://github.com/travis-ci/travis-ci/issues/4393),
we can use the Travis minimal image.
The minimal image should take less time to setup and lead to quicker builds.

Also addressed while I'm in here:
- No need to delete the broken google-chrome repo in the minimal image
- Set the hostname to work-around an openjdk bug
- Remove the non-functional apt-cache option
- Remove useless message at completion
- Install jre where the java tests are run

.travis.yml

@@ -1,17 +1,17 @@
-# errata:
-# - A travis bug causes caches to trample eachother when using the same
-#   compiler key (which we don't use anyway). This is worked around for now by
-#   replacing the "compilers" with a build name prefixed by the no-op ":"
-#   command. See: https://github.com/travis-ci/travis-ci/issues/4393
-# - sudo/dist/group are set so as to get Blue Box VMs, necessary for [loopback]
-#   IPv6 support
-
 sudo: required
 dist: trusty
 
+#workaround for https://github.com/travis-ci/travis-ci/issues/5227
+addons:
+  hostname: bitcoin-tester
+
 os: linux
-language: cpp
-compiler: gcc
+language: generic
+cache:
+  directories:
+  - depends/built
+  - depends/sdk-sources
+  - $HOME/.ccache
 env:
   global:
     - MAKEJOBS=-j3
@@ -25,35 +25,25 @@ env:
     - SDK_URL=https://bitcoincore.org/depends-sources/sdks
     - PYTHON_DEBUG=1
     - WINEDEBUG=fixme-all
-cache:
-  apt: true
-  directories:
-  - depends/built
-  - depends/sdk-sources
-  - $HOME/.ccache
-matrix:
-  fast_finish: true
-  include:
-    - compiler: ": ARM"
-      env: HOST=arm-linux-gnueabihf PACKAGES="g++-arm-linux-gnueabihf" DEP_OPTS="NO_QT=1" CHECK_DOC=1 GOAL="install" BITCOIN_CONFIG="--enable-glibc-back-compat --enable-reduce-exports"
-    - compiler: ": Win32"
-      env: HOST=i686-w64-mingw32 DPKG_ADD_ARCH="i386" DEP_OPTS="NO_QT=1" PACKAGES="python3 nsis g++-mingw-w64-i686 wine1.6 bc" RUN_TESTS=true GOAL="install" BITCOIN_CONFIG="--enable-reduce-exports"
-    - compiler: ": 32-bit + dash"
-      env: HOST=i686-pc-linux-gnu PACKAGES="g++-multilib bc python3-zmq" DEP_OPTS="NO_QT=1" RUN_TESTS=true GOAL="install" BITCOIN_CONFIG="--enable-zmq --enable-glibc-back-compat --enable-reduce-exports LDFLAGS=-static-libstdc++" USE_SHELL="/bin/dash"
-    - compiler: ": Win64"
-      env: HOST=x86_64-w64-mingw32 DPKG_ADD_ARCH="i386" DEP_OPTS="NO_QT=1" PACKAGES="python3 nsis g++-mingw-w64-x86-64 wine1.6 bc" RUN_TESTS=true GOAL="install" BITCOIN_CONFIG="--enable-reduce-exports"
-    - compiler: ": bitcoind"
-      env: HOST=x86_64-unknown-linux-gnu PACKAGES="bc python3-zmq" DEP_OPTS="NO_QT=1 NO_UPNP=1 DEBUG=1" RUN_TESTS=true GOAL="install" BITCOIN_CONFIG="--enable-zmq --enable-glibc-back-compat --enable-reduce-exports CPPFLAGS=-DDEBUG_LOCKORDER"
-    - compiler: ": No wallet"
-      env: HOST=x86_64-unknown-linux-gnu PACKAGES="python3" DEP_OPTS="NO_WALLET=1" RUN_TESTS=true GOAL="install" BITCOIN_CONFIG="--enable-glibc-back-compat --enable-reduce-exports"
-    - compiler: ": Cross-Mac"
-      env: HOST=x86_64-apple-darwin11 PACKAGES="cmake imagemagick libcap-dev librsvg2-bin libz-dev libbz2-dev libtiff-tools python-dev" BITCOIN_CONFIG="--enable-reduce-exports" OSX_SDK=10.9 GOAL="deploy"
-  exclude:
-    - compiler: gcc
+  matrix:
+# ARM
+    - HOST=arm-linux-gnueabihf PACKAGES="g++-arm-linux-gnueabihf" DEP_OPTS="NO_QT=1" CHECK_DOC=1 GOAL="install" BITCOIN_CONFIG="--enable-glibc-back-compat --enable-reduce-exports"
+# Win32
+    - HOST=i686-w64-mingw32 DPKG_ADD_ARCH="i386" DEP_OPTS="NO_QT=1" PACKAGES="python3 nsis g++-mingw-w64-i686 wine1.6 bc openjdk-7-jre-headless" RUN_TESTS=true GOAL="install" BITCOIN_CONFIG="--enable-reduce-exports"
+# 32-bit + dash
+    - HOST=i686-pc-linux-gnu PACKAGES="g++-multilib bc python3-zmq openjdk-7-jre-headless" DEP_OPTS="NO_QT=1" RUN_TESTS=true GOAL="install" BITCOIN_CONFIG="--enable-zmq --enable-glibc-back-compat --enable-reduce-exports LDFLAGS=-static-libstdc++" USE_SHELL="/bin/dash"
+# Win64
+    - HOST=x86_64-w64-mingw32 DPKG_ADD_ARCH="i386" DEP_OPTS="NO_QT=1" PACKAGES="python3 nsis g++-mingw-w64-x86-64 wine1.6 bc openjdk-7-jre-headless" RUN_TESTS=true GOAL="install" BITCOIN_CONFIG="--enable-reduce-exports"
+# bitcoind
+    - HOST=x86_64-unknown-linux-gnu PACKAGES="bc python3-zmq openjdk-7-jre-headless" DEP_OPTS="NO_QT=1 NO_UPNP=1 DEBUG=1" RUN_TESTS=true GOAL="install" BITCOIN_CONFIG="--enable-zmq --enable-glibc-back-compat --enable-reduce-exports CPPFLAGS=-DDEBUG_LOCKORDER"
+# No wallet
+    - HOST=x86_64-unknown-linux-gnu PACKAGES=" openjdk-7-jre-headless python3" DEP_OPTS="NO_WALLET=1" RUN_TESTS=true GOAL="install" BITCOIN_CONFIG="--enable-glibc-back-compat --enable-reduce-exports"
+# Cross-Mac
+    - HOST=x86_64-apple-darwin11 PACKAGES="cmake imagemagick libcap-dev librsvg2-bin libz-dev libbz2-dev libtiff-tools python-dev" BITCOIN_CONFIG="--enable-reduce-exports" OSX_SDK=10.9 GOAL="deploy"
+
 before_install:
     - export PATH=$(echo $PATH | tr ':' "\n" | sed '/\/opt\/python/d' | tr "\n" ":" | sed "s|::|:|g")
 install:
-    - if [ -n "$PACKAGES" ]; then sudo rm -f /etc/apt/sources.list.d/google-chrome.list; fi
     - if [ -n "$PPA" ]; then travis_retry sudo add-apt-repository "$PPA" -y; fi
     - if [ -n "$DPKG_ADD_ARCH" ]; then sudo dpkg --add-architecture "$DPKG_ADD_ARCH" ; fi
     - if [ -n "$PACKAGES" ]; then travis_retry sudo apt-get update; fi
@@ -83,4 +73,3 @@ script:
 after_script:
     - echo $TRAVIS_COMMIT_RANGE
     - echo $TRAVIS_COMMIT_LOG
-    - if [ "$TRAVIS_PULL_REQUEST" != "false" ]; then (echo "Upload goes here. Something like: scp -r $BASE_OUTDIR server" || echo "upload failed"); fi