merge ansible role octavia_preconf as per jira OSPC-189

[puni4220]

this PR is being raised for jira [1] to merge the ansible role to automate the required pre-requisites for enabling the amphora provider for octavia. The ansible role currently has tasks for:

1. creating the lb-mgmt-net and lb-mgmt-subnet
2. creating the required security groups
3. creating the ssh keypair for logging into amphora
4. creating the required certificates for the amphora provider
5. creating the required helm amphora values file to enable the amphora provider
6. creating the required flavor for the amphora instances
7. modifying the quotas for the admin tenant to accomodate amphorae
8. creating the health-manager ports

the role can run from the bastion node and currently has a required to use a shell script because the openstack.cloud.port module doesn't include "--host" argument which is required for creating health-manager ports. It should also be note that currently the ansible role creates health-manager ports for nodes labelled as "openstack-control-plane=enabled"

I will be raising a separate PR for the playbook to run this ansible role and a document

[1] https://rackspace.atlassian.net/browse/OSPC-189

[japerezjr]

Tested in lab and worked as expected.

[puni4220]

Hello, I've removed the tests directory from the ansible role to prevent the CI jobs from trying to run the role and modified the shell scripts accordingly

[rackerchris]

failing due to ansible-lint and trailing whitespaces.

[cloudnull]

This is great. Just a couple nits on the readme and a few changes to make the linter happy. I would also like to see the practical application of this role documented within our octavia operations guide.

[rackerchris]

LGTM +1