Update puppet-vswitch

Currently we are using all merged patches in OPM RPM anyway,
so we need to update this repo ASAP.

stackforge/puppet-vswitch@b7a15fc Allow non-word characters in vs_bridge external_ids
stackforge/puppet-vswitch@0351844 Normalize Gemfile & pin tests to rspec < 2.99
stackforge/puppet-vswitch@8f4047e Fixed ovs provider
stackforge/puppet-vswitch@49dbaff Release 0.3.0