Assign unique name to each fake nova-compute

Without a unique name, the scheduler (and anything else, really) will
consider each of these nova-compute processes as being one and the same,
so only one entry in the services table, only one hypervisor seen by the
scheduler, etc. Assigning unique names lets us simulate an arbitrary
amount of nova-computes which is very handy for benchmarking the
scheduler.

Change-Id: Ie03aad81bd2a8e73b876a9eae934bc00bf2f71e9
XenAPI:  Increase DomU's memory

Devstack has been increasing in complexity, and if we use too
much of our memory it can lead to fragmentation which in turn
causes a DomU error and a failure of random tests.

Change-Id: Ide9cc84625caed4e35a64a47ee1e92a6cd567651
Fix a couple of INI whitespace bugs

* iniset() bails if no section or option (attribute) is supplied
* merge_config_file() properly skips lines with only whitespace

* Also split the ini-tests into their own script

Bug 1257954

Change-Id: Ie31c5bd0df8dfed129fbcf1e37228aaf25e9305d
Merge "Assign unique name to each fake nova-compute"
Merge "XenAPI:  Increase DomU's memory"