HBASE-12312 Another couple of createTable race conditions

Signed-off-by: stack <stack@apache.org>
Implement Preemptive Fast Fail

Summary: This diff ports the Preemptive Fast Fail feature to OSS. In multi threaded clients, we use a feature developed on 0.89-fb branch called Preemptive Fast Fail. This allows the client threads which would potentially fail, fail fast. The idea behind this feature is that we allow, among the hundreds of client threads, one thread to try and establish connection with the regionserver and if that succeeds, we mark it as a live node again. Meanwhile, other threads which are trying to establish connection to the same server would ideally go into the timeouts which is effectively unfruitful. We can in those cases return appropriate exceptions to those clients instead of letting them retry.

Test Plan: Unit tests

Differential Revision: https://reviews.facebook.net/D24177

Signed-off-by: stack <stack@apache.org>
Add more notes on why 0.96 -> 1.0 rolling upgrade not possible
Add note to upgrade section on HBASE-12068; i.e. things to do if you have custom filters
HBASE-12297 Support DBB usage in Bloom and HFileIndex area.
HBASE-12285 Builds are failing, possibly because of SUREFIRE-1091 ; ADDENDUM SETTING LOG LEVEL TO DEBUG AGAIN
HBASE-12354 Update dependencies in time for 1.0 release
HBASE-12313 Redo the hfile index length optimization so cell-based rather than serialized KV key
HBASE-12372 [WINDOWS] Enable log4j configuration in hbase.cmd
HBASE-12355 Update maven plugins