Revert "HBASE-12495 Use interfaces in the shell scripts (Solomon Duskis)"

This reverts commit 929bb34181a2218a88773d7c493fc22f005d8a98.
Revert "HBASE-12471 Task 4. replace internal ConnectionManager#{delete,get}Connection use with #close, #createConnection (0.98, 0.99)" ADDENDUM
HBASE-12532 TestFilter failing occasionally with ExitCodeException doing chmod since HBASE-10378
HBASE-12532 TestFilter failing occasionally with ExitCodeException doing chmod since HBASE-10378 ADDENDUM