xenapi: enable user interaction with stack.sh

In XenServer, devstack runs inside a virtual machine. This makes it hard
for the user to interact with stack.sh should a parameter be missing.
This change will create an upstart job (devstack) that runs
stack.sh with console enabled so user can interact with it by running
vncviewer or using XenCenter.

Logging the output is also disabled, stamp files are used instead to
detect the script run status in case install_os_domU.sh is used.

As run.sh.log is removed, standard devstack logging should be used.

The change also removes the environment settings from run.sh, as they
are not needed, they should be specified in localrc. This way user
cannot get different experiences by using unstack.sh/stack.sh or run.sh

Also a proper unstack.sh is called instead of killing screen in run.sh

Change-Id: I7eb12bd74746cc7a1db3aa9fd68ece645a50001d
add assertions for blind grep

blind grep is error-prone.
Add assertions for errors we can not handle

Change-Id: Ibe19085545ecc848498506e8b8ee14e71825b273
Allow deploying keystone with SSL certificates

Allow providing certificates through environment variables to be used
for keystone, and provide the basis for doing this for other services.
It cannot be used in conjunction with tls-proxy as the service provides
it's own encrypted endpoint.

Impletmenting: blueprint devstack-https
Change-Id: I8cf4c9c8c8a6911ae56ebcd14600a9d24cca99a0
Attempt to retrieve the vmdk descriptor data-pair

VMDK formats such as monolithicFlat and vmfs require two files to be
fully consumable by the Nova drivers (a descriptor-data pair: *.vmdk and
*-flat.vmdk).
On the upload of the descriptor (*.vmdk), upload_image.sh should attempt to
retrieve the *-flat.vmdk. The same way, the descriptor should be
retrieved when a flat disk is uploaded.
On success, the upload script will be able to use the flat disk as the image
content and the relevant descriptor settings as the image metadata.

Change-Id: I9214754029c46dd60b9e7d606d84d8819a498a8d
Closes-Bug: #1252443
Merge "Allow deploying keystone with SSL certificates"
Fix noVNC git repo

Recent change switched base git URL to git.openstack.org.
However, noVNC is only hosted on GitHub.
Change git repo URL for noVNC back to the GitHub one.

Change-Id: Iaa9f570639301be1c29cc400c1c73afcbf637b70
Merge "Attempt to retrieve the vmdk descriptor data-pair"
Merge "add assertions for blind grep"
Merge "Fix noVNC git repo"
Merge "xenapi: enable user interaction with stack.sh"