MB-100: MemorySanityTests

- Repetetively delele-create bucket,
monitoring memory consumption
- multi bucket support
- repetition_count: no. of cycles

Change-Id: I7d13589caeb4e305b007abb0d37e527f35dc8b95
Reviewed-on: http://review.couchbase.org/26870
Tested-by: abhinav dangeti <abhinav.dangeti@gmail.com>
Reviewed-by: Ketaki Gangal <ketakigangal@gmail.com>
Tested-by: Ketaki Gangal <ketakigangal@gmail.com>