Re-factor instance DB creation

This patch speeds up the DB creation process considerably in deployments
with a considerable amount of instances.  It also cleans up a lot of the
code which ends up creating the instance DB record.

The biggest improvement in this patch is removing unnecessary joins in
security_groups DB calls.  This also reduces the number of DB calls
needed to create an instance DB record in general.

Side effect of this patch is the default 'display_name' for an instance
when it (or hostname) is not specified is now 'Server <uuid>' vs
'Server <id>'.  Because of the use of 'id', it required creating the DB
record, then updating the record later after we new the 'id'.  This is
gone.

Fixes bug 1017722

Change-Id: I9b7d48644a7abe075545c2c11399351b6a37939c

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