Travis: Try fix ccache (#1900)

* Travis: Try fix ccache

.travis.yml

@@ -28,6 +28,8 @@ matrix:
       cache:
         ccache: true
         timeout: 1000
+        directories:
+        - /home/travis/.ccache
 
       addons:
         apt:

debian/pbuilder-hooks/A00ccache

@@ -6,8 +6,6 @@ echo "CCACHEDIR=$CCACHEDIR CCACHE_DIR=$CCACHE_DIR SET_CCACHEDIR=$SET_CCACHEDIR"
 
 [ -z "$CCACHE_DIR" ] && export CCACHE_DIR=${CCACHEDIR:=${SET_CCACHEDIR=/var/cache/pbuilder/ccache}}
 
-df -h
-
 if [ -n "$CCACHE_DIR" ]; then
     mkdir -p $CCACHE_DIR || true
     chown -R $BUILDUSERID:$BUILDUSERID $CCACHE_DIR || true

utils/travis/pbuilder.sh

@@ -19,7 +19,7 @@ env TEST_RUN=${TEST_RUN=1} \
     PBUILDER_OPT="--timeout ${PBUILDER_TIMEOUT:=35m} $PBUILDER_OPT" \
     `# clang faster than gcc` \
     DEB_CC=${DEB_CC=$CC} DEB_CXX=${DEB_CXX=$CXX} \
-    CCACHE_SIZE=${CCACHE_SIZE:=4G} SET_CCACHEDIR=${SET_CCACHEDIR=$HOME/.ccache} \
+    CCACHE_SIZE=${CCACHE_SIZE:=4G} \
     `# Disable all features` \
     CMAKE_FLAGS="-DCMAKE_BUILD_TYPE=Debug -DUNBUNDLED=1 -DENABLE_UNWIND=0 -DENABLE_MYSQL=0 -DENABLE_CAPNP=0 -DENABLE_RDKAFKA=0 -DUSE_EMBEDDED_COMPILER=1 -DCMAKE_C_FLAGS_ADD='-O0 -g0' -DCMAKE_CXX_FLAGS_ADD='-O0 -g0' $CMAKE_FLAGS" \
     `# Use all possible contrib libs from system` \