Readthedocs failed to render Armada exceptions with error:
> WARNING: autodoc: failed to import exception ... from module
> 'armada'; the following exception was raised: No module named 'armada'
and others.
Trying to add Armada requirements to the installed requirements list,
so that Readthedocs has all modules, including those needed for the
Armada itself.
Cosmetic readability changes:
1. combined all Makefile .PHONY targets into one
2. merged multiple LABEL instructions in Dockerfile into one
Change-Id: I3f88fa3abf66e5d6a2f9e57f6f1514a03a0c5a30
243022d16c