fixed #7031: use of undefined variable in ZendCacheStorageAdapterApc::internalGetMetadatas()
#7032 - minor CS fix: avoiding defining a variable in an if-else block
#7031 #7032 - adding `@group` test annotation
Merge branch 'hotfix/#7032-fix-undefined-variable-in-cache-apc-storage' into develop

Close #7032
Close #7031