Neutron juno upgrade

Updated keystone options.

update api-paste from upstream
  Also use keystone middleware identity_uri

refresh policy from upstream

Update nova notification details with the right tenant

Add support for migrating neutron database
Upgrade percona to 5.6

A neutron migration will crash 5.5
sst method upgraded to v2. Previous version does not work.
Update heat to juno

Minor config adjustments refreshing against juno upstream
Update client software to latest master

Everything should be updated right?
Replace NOVA_VERSION with OS_COMPUTE_API_VERSION as per upstream
changes.
Update swift to juno

Adjust config files with upstream examples from juno.