Updated version requirement for pyghmi

This patch updated the pyghmi version from 0.5.8 to 0.6.11.
pyghmi is required by ironic. The newer version of pyghmi
has serial console support as well as some bug fixes that
are required by ironic.

Change-Id: I11f60bf7d38def0ba7686c89890e262c155c703c
Bump minimum hacking version to 0.9.2

Hacking 0.9.2 has a fix for the library six.
Related patch: I4e401e0fcce077f81a5471692aa6ecd16f26f6ed

Change-Id: I94ac3d6eb68f762f9bf0706a2bd9cd3b953178c8
Merge "Updated version requirement for pyghmi"
Merge "Bump minimum hacking version to 0.9.2"