Add UID of Trove assigned during installation (F20/EL6/EL7)

According to the latest SPECs used for F20/EL6/EL7 there is no
specific UID used for Trove.

Latest SPECs are available at
http://repos.fedorapeople.org/repos/openstack/openstack-icehouse/.

---snip---
getent passwd $USERNAME >/dev/null || \
  useradd -r -g $GROUPNAME -G $GROUPNAME -d $HOMEDIR -s /sbin/nologin \
    -c "$USERNAME Daemons" $USERNAME
---snap---

Change-Id: I651979d76f25692d30a8447d9e1a16ef6263696c
Install Guide: One message broker to rule them all

Remove Qpid specific setup for Fedora etc, use RabbitMQ everywhere.

Change-Id: I75a45f070c4a5ed3770504b296824d7dc6075c23
Implements: blueprint installation-guide-improvements
backport: none
Imported Translations from Transifex

Change-Id: Id401572a5e21f840444eae58b75d216bc7a51e8c
Merge "Install Guide: One message broker to rule them all"
Merge "Imported Translations from Transifex"
Merge "Add UID of Trove assigned during installation (F20/EL6/EL7)"