Fix v3 server rebuild deserializer checking with wrong access_ip key

When rebuild server with xml format, the xml deserializer code
are checking with wrong key. So rebuilding with access_ips doesn't
make any effect. So correct the wrong key 'access_ipv4', 'access_ipv6'
to 'access_ip_v4', 'access_ip_v6'.

Change-Id: I8fccf3727f193bf9142dc814a76a32d5ab1a1b0a
Closes-bug: #1221646
Merge "Fix v3 server rebuild deserializer checking with wrong access_ip key"
xenapi: refactor: move UpdateGlanceImage to common

During the review of https://review.openstack.org/41651 it was
recommended to move UpdateGlanceImage to a common library. A bug was
filed to deal with the refactors. This change fixes the first part.

Fixes bug 1220596

Change-Id: I95ae89525b7e6768c5a70364945d5a10cb906d88
XenAPI: Fix translation of metadetails in aggregates

https://review.openstack.org/#/c/43157/ added a translation from the sqlalchemy model to
the instance object replacing metadetails with metadata.

This added more traces in general for XenAPI (when we queried whether we were using
aggregates) and actually broke the host aggregate functionality

Change-Id: I87195753931945b6e1ecf75bc81575a6fa03068e
Closes-bug: 1232179
xenapi: post install scriptlet to rpm

A post install script that creates the /images directory on xenserver,
and sets up the trust relationship.

Change-Id: Id57e3a3ab2782550468c6aa4c01059ceb7cc81ab