travis: more cleanup (#3336)

* add links to build image update history

* remove cmake from apt

* remove bc from apt

* remove clang-format from apt

* test clang-format

* Revert "test clang-format"

This reverts commit b2f12da427.

* remove protobuf from apt

* Revert "remove protobuf from apt"

This reverts commit 9162c8800c.

* remove qt from apt

* test with versions which differ from what xenial provides

* Revert "test with versions which differ from what xenial provides"

This reverts commit 6192e58169.

* Revert "remove qt from apt"

This reverts commit 0d9aff1c4c.

* conditions v1 are the default now

https://blog.travis-ci.com/2018-07-18-build-stages-officially-released

* add new job names

https://docs.travis-ci.com/user/customizing-the-build/?utm_source=blog&utm_medium=web&utm_campaign=build_stages_ga#Naming-Jobs-within-Matrices

* disable mail

* clang-format version

* remove clang source

* cmake version

* macOS: remove clang-format

formatting only checked on linux build

* add compiler info

* cmake version2

* remove fast_finish

only useful if allowed failures are configured in the matrix:
https://docs.travis-ci.com/user/customizing-the-build/#fast-finishing

.ci/travis-compile.sh

@@ -16,6 +16,8 @@ if [[ $TRAVIS_OS_NAME == "linux" ]]; then
   prefix="-DCMAKE_PREFIX_PATH=$(echo /opt/qt5*/lib/cmake/)"
 fi
 
+cmake --version
+
 if [[ $BUILDTYPE == "Debug" ]]; then
   cmake .. -DWITH_SERVER=1 -DCMAKE_BUILD_TYPE=$BUILDTYPE $prefix -DTEST=1
   make -j2
@@ -27,6 +29,7 @@ if [[ $BUILDTYPE == "Debug" ]]; then
 
   if [[ $TRAVIS_OS_NAME == "linux" ]]; then
     cd ..
+    clang-format -version
     clang-format -i \
       common/*.h \
       common/*.cpp \

.ci/travis-dependencies.sh

@@ -2,7 +2,7 @@
 
 if [[ $TRAVIS_OS_NAME == "osx" ]] ; then
   brew update
-  brew install ccache clang-format protobuf qt
+  brew install ccache protobuf qt
 fi
 if [[ $TRAVIS_OS_NAME == "linux" ]] ; then
   echo Skipping... packages are installed with the Travis apt addon for sudo disabled container builds