OpenTSDB: Moved create-src-dir-overlay.sh to build-aux. (https://rbcommons.com/s/pepperdata/r/3372)
Moved create-src-dir-overlay.sh to the build-aux directory and to the make file
so it's executed when someone builds the POM per the request of manolama (Chris
Larsen). See the comments at https://github.com/pepperdata/opentsdb/commit/38d4d
23021da328ac52d6cd8542fcf6c1bbed012