remove ccache from all docker images

templates/tools/dockerfile/ccache_setup.include

@@ -1,7 +0,0 @@
-# Prepare ccache
-RUN ln -s /usr/bin/ccache /usr/local/bin/gcc
-RUN ln -s /usr/bin/ccache /usr/local/bin/g++
-RUN ln -s /usr/bin/ccache /usr/local/bin/cc
-RUN ln -s /usr/bin/ccache /usr/local/bin/c++
-RUN ln -s /usr/bin/ccache /usr/local/bin/clang
-RUN ln -s /usr/bin/ccache /usr/local/bin/clang++

templates/tools/dockerfile/run_tests_addons.include

@@ -1,2 +1,2 @@
-<%include file="ccache_setup.include"/>
-<%include file="run_tests_addons_nocache.include"/>
+
+RUN mkdir /var/local/jenkins

templates/tools/dockerfile/run_tests_addons_nocache.include

@@ -1,2 +0,0 @@
-
-RUN mkdir /var/local/jenkins

templates/tools/dockerfile/test/cxx_ubuntu1404_x64/Dockerfile.template

@@ -20,6 +20,6 @@
   <%include file="../../gcp_api_libraries.include"/>
   <%include file="../../python_deps.include"/>
   <%include file="../../cxx_deps.include"/>
-  <%include file="../../run_tests_addons_nocache.include"/>
+  <%include file="../../run_tests_addons.include"/>
   # Define the default command.
   CMD ["bash"]