Disable ServerSignature and Hide apache related infromation.

Change-Id: I9188ddb85988539087c922117bb9f53454b7507c

Apache access log formats are modified to be consistent with
the format defined in wsgi-keystone.conf, which includes
the response time (%D) and X-forwarder-For fields.

Change-Id: I02aa5eb106fb894196dfb6e22daf2968e27ed3cb
Closes-Bug: #1703571

Trace method is enabled in default for httpd. There is security risk
with trace enabled. So disable it in default. more info please check[0].

[0] https://security.stackexchange.com/a/7711

Change-Id: I4496a6d058d88e1abfb210085f189e7a610e0362
Closes-Bug: #1705160

Useful api_interface_address variable has been define here:
https://github.com/openstack/kolla-ansible/blob/master/ansible/group_vars/all.yml#L57
In order to simplify codebase we must use it as much as possible.

Change-Id: I18fec19bf69e05a22a4142a9cd1165eccd022455

TrivialFix

Change-Id: Ifeaf69c9a3c8cf7ee85f831793311a011d778f6e

Partially-Implements: blueprint ansible-aodh

Change-Id: I9e20f4bf5e7d8f37f243ae15746e2b7bb49eb20c