Change httpd Keystone access log to keystone_access.log

Keystone's access log was going to httpd/access.log, which is the
common place for all access logging. This made it difficult to see
Keystone accesses apart from other access. Keystone's access log
will now be keystone_access.log

This makes the Keystone configuration similar to Horizon which uses
horizon_access.log.

Change-Id: I6e5ac121302b3d138758e6c49dffa9f05ad2fb85
Partial-Bug: #1359995
Keystone access log in key-access screen

When Keystone was run in Apache Httpd the access log wasn't in a
screen. A new screen called key-access is now started with
Keystone's access log.

Change-Id: Ie1f4d4b679e1b9c87f0cea37deb25f7b6636fe01
Closes-Bug: #1359995
Simplify ironic-python-agent download

The kernel and ramdisk for IPA are now uploaded separately, this
commit simplifies the download by downloading them separately.

Change-Id: I630b0a9c3d1179a6b97754f1474f62ae7da068a5
FAQ: Removed LXC not being supported on Fedora

Change-Id: Ie62e3d81170702c1b87077f6a1a82f407587c684
Fix to avoid undefined variables in initial sanity checks

This commit moves check to see if screen is already running after reading
stackrc, and changes messages in check if root is running DevStack.
STACK_USER is defined in stackrc, and SCREEN_NAME can be replaced with
"a non-root account".

Change-Id: I022ed1099169a3549b7e31883abe33d6298f6fa5
Closes-Bug: #1362091
Merge "Fix to avoid undefined variables in initial sanity checks"
Merge "FAQ: Removed LXC not being supported on Fedora"
Merge "Simplify ironic-python-agent download"
Merge "Change httpd Keystone access log to keystone_access.log"
Merge "Keystone access log in key-access screen"