Updated file tox.ini allows to check code style in all ".sh" files
included in Ironic Python Agent. Checking can be invoked by calling either
"tox" or "tox -e pep8".
Change-Id: Ie76605737c7db10a064f2aebfda388372a4c0591
Closes-Bug: #1625215
Currently, building ramdisks installs ironic-python-agent without any
upper-constraints. This causes the package to be installed with newer,
untested dependencies.
This commits introduces a tool to generate a local upper-constraints
file based on predefined strategies (below). Additionally, the fallback
to the openstack/requirements uses the URL defined in tox.ini instead of
redefining it. This prevents having to keep track of two separate
variables when releasing.
upper-constraints lookup strategies (in order):
* UPPER_CONSTRAINTS_FILE points to a local file
* UPPER_CONSTRAINTS_FILE points to a URL
* /opt/stack/new/requirements/upper-constraints.txt
* upper-constraints.txt from openstack/requirements git repository
Partial-bug: #1616554
Change-Id: Ib5c0c57cafdb6ffd7456e61f3b1bb5fa57520e5a
