snapshot: qemu: Rename qemuDomainSnapshotCreateActive
snapshot: qemu: Rename qemuDomainSnapshotCreateActive

https://bugzilla.redhat.com/show_bug.cgi?id=638512

Before now, libvirt supported only internal snapshots for active guests.
This patch renames this function to qemuDomainSnapshotCreateActiveInternal
to prepare the grounds for external active snapshots.
(cherry picked from commit b5fd4044716ac1d764c694f4d2a5382f70b9e38f)

mithleshvrts/libvirt-0.10.2,mithleshvrts/libvirt-0.10.2,mithleshvrts/libvirt-0.10.2,mithleshvrts/libvirt-0.10.2,mithleshvrts/libvirt-0.10.2