Remove deep dependency from muranoapi

Use `muranoapi.common.utils.is_different` - simplified hand-written
replacement for deep.diff. It compares arbitrary nested objects,
handles circular references, but doesn't return first difference as
deep.diff does.

Change-Id: Iced775fa39342ed09fa31ed9ac63a5dadb9e3f84
Merge "Remove deep dependency from muranoapi"