LibvirtHybridOVSBridgeDriver update for STP

Fixes bug 1129055

The patch will set the stp status as 'off' and the bridge
forwarding delay to 0.

Cherry picked from 7aeb17d5bbf20f6ffc1c8ccab71f5cbbb57be9a2

Change-Id: Id6874de0752a23646360590794773e7a7028a945
Fix Wrong syntax for set:tag in dnsmasq startup option

Looks like the introduction of quotes in fix for previous
bug 1012443 was erroneous.

Fixes LP# 1152504

Change-Id: Ic84739e38e3b3567f1617302a33623de03196f85
(cherry picked from commit d8188ef32293659c5a12d99f82ac19b452184967)
Adding netmask to dnsmasq argument --dhcp-range

By default, dnsmasq will try to guess the proper subnet size but
sometimes it will fail. This patch provides the network netmask
to dnsmasq via the --dhcp-range argument.

Fixes: bug #1154929

Change-Id: I74d62c837b5310004b9151851697e3ea3b475f92
(cherry picked from commit fb151b5e3704c9a293f10ba89abc14f83d803c24)
Set default fixed_ip quota to unlimited.

DocImpact: our previous default quota of ten was poorly thought through
and resulted in upgrade problems. Instead, let's have operators opt into
fixed IP quotas. This change should be mentioned in release notes please.

Resolves bug 1161190.

Change-Id: I2f066a0129461899fe330a628cf49ee5273eaba4
(cherry picked from commit 78c7edc52efdf31d844b8bb38c2460add4c864fb)
Merge "Set default fixed_ip quota to unlimited." into stable/folsom
Merge "LibvirtHybridOVSBridgeDriver update for STP" into stable/folsom