HBASE-11819 Unit test for CoprocessorHConnection (Talat Uyarer) -- REVERT. Failed in a test run here: https://builds.apache.org/job/PreCommit-HBASE-Build/11530//testReport/
HBASE-12388 Document behavior wrt coprocessors when wal gets empty waledits.

Signed-off-by: stack <stack@apache.org>