Interactive console support for ipminative driver

This patch adds interactive serial console support for ipminative
driver using shellinaboxd and pyghmi. A new class called
NativeIPMIShellinaboxConsole implements the ConsoleInterface.

Closes-Bug: 1359758
Change-Id: I9117c695af40044491fb7f213aa15e841e803d1c
Merge "Interactive console support for ipminative driver"