Add bridge network to running container

[hickeng]

Where #703 covers the personality portion of network connect and the application to stopped containers, this issue adds support for running containers. The workflow is:

// pseudo-code for adding two networks (although this isn't likely supported via the client cli constructs)
netA := network.Get(netAID)
netB := network.Get(netBID)
handle := execution.Get(id)
handle = network.Join(handle, netA)
handle = network.Join(handle, netB)
handle = network.Bind(handle)

This issue is for doing so with the IPAM segregation based bridge networks only, not the mapped vSphere networks that require a PCI hotadd of a new vNIC.

[stuclem]

Already in the release notes, so removing the kind/note tag.