Setup the correct ec2 manifest path

setup correctly the path to the ec2 boundled images.

Change-Id: If3bce845e009a73c6b685976de3fa6d44b907bed
Clean /etc/mysql when calling clean.sh

The clean.sh script should also remove the /etc/mysql
directory. It contains information from the old
devstack installation and may conflict with the further
one. apt-get purge does not remove it since the
directory is not empty.

Change-Id: I885345a2311851d8746abe42e44300ecd4f6e08a
Set correct default disk bus back to virtio on ppc64

virtio is supported and should be the default disk bus on Power to
take advantage of I/O performance drivers. This aligns with Nova
default bus values on PowerKVM. SCSI is the default for cdrom.

Change-Id: I5de08c90359b3a500c352c09c07b6b082ddb4325
Merge "Clean /etc/mysql when calling clean.sh"
Merge "Setup the correct ec2 manifest path"
Merge "Set correct default disk bus back to virtio on ppc64"
Merge branch 'master' of github.com:openstack-dev/devstack