1. The Keystone WSGI scripts don't have a python3- prefix, although they
   are using python 3.

2. The Placement WSGI script doesn't have a python3- prefix, although it
   is using python 3.

Depends-On: https://review.openstack.org/651327
Change-Id: I805df8f85634edea8322495ca73897d44967cfe6
Closes-Bug: #1823989

Depends-On: https://review.openstack.org/#/c/642958
Depends-On: https://review.openstack.org/642984
Change-Id: If795a9eb3ec92f75867ce3f755d6b832eba31af9

Update wsgi configuration after services migrating to python3.

Change-Id: I25d8db36dabd5f148b2ec96a30381c6a86fa710e
Depends-On: https://review.openstack.org/#/c/625298/
Partially Implements: blueprint python3-support

This allows nova service endpoints to use custom hostnames, and adds the
following variables:

* nova_internal_fqdn
* nova_external_fqdn
* placement_internal_fqdn
* placement_external_fqdn
* nova_novncproxy_fqdn
* nova_spicehtml5proxy_fqdn
* nova_serialproxy_fqdn

These default to the old values of kolla_internal_fqdn or
kolla_external_fqdn.

This also adds the following variables:

* nova_api_listen_port
* nova_metadata_listen_port
* nova_novncproxy_listen_port
* nova_spicehtml5proxy_listen_port
* nova_serialproxy_listen_port
* placement_api_listen_port

These default to <service>_port, e.g. nova_api_port, for backward
compatibility.

These options allow the user to differentiate between the port the
service listens on, and the port the service is reachable on. This is
useful for external load balancers which live on the same host as the
service itself.

Change-Id: I7bcce56a2138eeadcabac79dd07c8dba1c5af644
Implements: blueprint service-hostnames

Use <project>_install_type instead of kolla_install_type
to set python_path. For example, general kolla_install_type
is 'binary', but user wants to deploy Horizon from 'source'.
Horizon templates still use python_path=/usr/share/openstack-dashboard,
it is wrong.

Change-Id: Ide6a24e17b1f8ab6506aa5e53f70693706830418

Disable ServerSignature and Hide apache related infromation.

Change-Id: I9188ddb85988539087c922117bb9f53454b7507c

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

Closes-Bug: #1660987
Depends-On: I30efc20e6d918e08860584c017455e6d5fa91a35
Change-Id: If0a79b6013f28871dc9f13c510c919078f3304d5