Use assertEqual() rather than assertEquals()

assertEquals() is deprecated:

  http://docs.python.org/2/library/unittest.html#deprecated-aliases

Change-Id: I9e74cb0f989854804f7bf7e89cb022925b47bf16
Add reload_config_files function

Add reload_config_files function for ConfigOpts instance to
reload all configuration files.

Implements blueprint cfg-reload-config-files

Change-Id: Ia4d96be170d1ddfaa70b8e467b9a19ed45dc4060
Merge "Use assertEqual() rather than assertEquals()"
Merge "Add reload_config_files function"