Added dependencies needed to install pyodbc

[dlfryar-zz]

pyodbc is needed by the Monasca Agent Vertica plugin

Added a Vertica Database plugin
https://review.openstack.org/#/c/195413/10

[dlfryar-zz]

I considered putting them in the Agent, however, our ansible-vertica role is specific to Monasca. If these were part of the ansible-monasca-agent and you were not running Vertica then you would get PIP/APT dependencies and config files that may or may not be applicable/needed. Our ansible-percona does something similar with the config file. Perhaps we need some duplication in ansible-monasca-agent - not sure.

node_dependencies.yml puts the PIP deps in the Monasca venv

• name: Install Vertica PIP dependencies
  pip: name=pyodbc state=present virtualenv="{{monasca_virtualenv_dir}}"
  when: not skip_install

[tkuhlman]

This doesn't seem the right place for this config. You are adding dependencies for a Vertica client, this role sets up the Vertica server. In many cases the client and server are not the same machine so I think the ability to install them independently is needed.

[dlfryar-zz]

Comparing it to the MySQL plugin which should have an equivalent argument, I didn't find it to be implemented that way. In the MySQL case the deps come from ansible-percona or monasca-vagrant.

http://postimg.org/image/9mci6dmof/