remove dump tables from previous migrations

dump tables from 012 and 027 migrations should really be handled
by DBAs. creating additional dump tables just consumes unnecessary
space.

Change-Id: I3a8716627c2f52a1a3c59f36009d8265ac96a0fa
Closes-Bug: #1259724
Use ConectionPool instead of one Connection in HBase

As part of this patch thread become monkey-patched

Closes bug 1298455

Change-Id: I2822983b2d3768bb78b1d4b11db2c64c2020ef50
Merge "Use ConectionPool instead of one Connection in HBase"
Merge "remove dump tables from previous migrations"