OFBIZ-4098 Implement step 1 of the cache refactoring:
1. Reduce UtilCache down to a utility class containing only static methods
2. Move global cache management responsibilities to an OFBizCacheManager implementation
3. Move individual cache management responsibilities to an OFBizCache implementation
4. Change all UtilCache object references to OFBizCache references

Next step: extract interfaces from OFBizCacheManager and OFBizCache


git-svn-id: https://svn.apache.org/repos/asf/ofbiz/branches/OFBIZ-4098-make-cache-pluggable@1647483 13f79535-47bb-0310-9956-ffa450edef68