Re-enable "vlan" mode for openvswitch

Force "use_vlan" to false on the nova_fixed network when using vlan modes.

When ovs is used in vlan-mode quantums sets up an ovs-bridge to do the vlan
tagging. That bridge needs be attached to a none VLAN interface in order to
work correctly.

When linux-bridge is used quantum's linux bridge agent will create the correct
vlan interfaces automatically.

For the openvswitch vlan mode there is the limitation, that the bridge for the
openvswitch network needs to be on top a different physical device (or bond)
than the "admin" network.  Otherwise nodes might not come up correctly after a
reboot. Currently the quantum UI will display a warning about that.

A working openvswitch vlan mode is a requirement for the cisco nexus switch
support.
Fix sqlalchemy related quantum.conf options

idle_timeout, min_pool_size, max_pool_size and pool_timeout are not valid
options from quantum.conf. Use the correct ones now. Removed the "idle_timeout"
option as there is no equivalent for it in quantum.conf unless using MySQL with
eventlet's db_pool which our config doesn't. Renamed max_pool_size to
max_pool_overflow to better reflect what it is used for.

Increase the default values for min_pool_size as quantum seems to be greedy
on database connections (see: https://bugs.launchpad.net/tripleo/+bug/1184484)

Use the default value of 30 for pool_timeout, as this is what quantum was using
up to now.
missed LB agent package definition
Move updated packages for RHEL to the right section.
Merge pull request #125 from MirantisDellCrowbar/DCB-149-linuxbridge

https://github.com/crowbar/barclamp-quantum/pull/125

Merged by devtool for ArkadyKanevsky
Merge pull request #113 from rhafer/fix/ovs-vlan

https://github.com/crowbar/barclamp-quantum/pull/113

Merged by devtool for ArkadyKanevsky
Merge pull request #120 from rhafer/fix/sqlalchemy-pool

Fix sqlalchemy related quantum.conf options
Remove link from subscribes and bring plugin_cfg_path to the same species
Fix root_helper string in ovs_quantum_plugin.ini
Commented out network_vlan_ranges in ovs_quantum_plugin.ini till transfer OVS section from quantum.conf
Move template of ovs_quantum_plugin.ini to common_install.rb
Return link resource for non PFS and add template for linuxbridge in pfs
Add link subscription for non PFS