esx: Support for disk-only and quiescing snapshots.
esx: Support for disk-only and quiescing snapshots.

Add support for creating disk-only (no memory) snapshots in esx, and
for quiescing the VM before taking the snapshot. The VMware API
supports these operations directly, so adding support to libvirt is
just a matter of setting the flags correctly when calling
VMware. VIR_DOMAIN_SNAPSHOT_CREATE_DISK_ONLY and
VIR_DOMAIN_SNAPSHOT_CREATE_QUIESCE are now valid flags for esx.

Signed-off-by: Eric Blake <a9da18479c871fe903d9590822cfe2629c6a4d11@redhat.com>

elmarco/libvirt,datto/libvirt,cbosdo/libvirt,VenkatDatta/libvirt,jardasgit/libvirt,taget/libvirt,zhlcindy/libvirt-1.1.4-maintain,taget/libvirt,olafhering/libvirt,agx/libvirt,shugaoye/libvirt,fabianfreyer/libvirt,jfehlig/libvirt,andreabolognani/libvirt,libvirt/libvirt,VenkatDatta/libvirt,shugaoye/libvirt,zippy2/libvirt,cbosdo/libvirt,jardasgit/libvirt,olafhering/libvirt,rlaager/libvirt,fabianfreyer/libvirt,elmarco/libvirt,agx/libvirt,eskultety/libvirt,VenkatDatta/libvirt,fabianfreyer/libvirt,zhlcindy/libvirt-1.1.4-maintain,jfehlig/libvirt,andreabolognani/libvirt,cbosdo/libvirt,libvirt/libvirt,datto/libvirt,crobinso/libvirt,rlaager/libvirt,libvirt/libvirt,elmarco/libvirt,zippy2/libvirt,rlaager/libvirt,eskultety/libvirt,cbosdo/libvirt,fabianfreyer/libvirt,jardasgit/libvirt,rlaager/libvirt,datto/libvirt,zhlcindy/libvirt-1.1.4-maintain,andreabolognani/libvirt,andreabolognani/libvirt,zippy2/libvirt,shugaoye/libvirt,nertpinx/libvirt,zhlcindy/libvirt-1.1.4-maintain,datto/libvirt,rlaager/libvirt,zippy2/libvirt,eskultety/libvirt,olafhering/libvirt,nertpinx/libvirt,taget/libvirt,eskultety/libvirt,jardasgit/libvirt,eskultety/libvirt,fabianfreyer/libvirt,datto/libvirt,elmarco/libvirt,crobinso/libvirt,jardasgit/libvirt,libvirt/libvirt,cbosdo/libvirt,taget/libvirt,jfehlig/libvirt,andreabolognani/libvirt,agx/libvirt,taget/libvirt,zhlcindy/libvirt-1.1.4-maintain,crobinso/libvirt,shugaoye/libvirt,shugaoye/libvirt,crobinso/libvirt,agx/libvirt,nertpinx/libvirt,VenkatDatta/libvirt,nertpinx/libvirt,elmarco/libvirt,jfehlig/libvirt,VenkatDatta/libvirt,olafhering/libvirt,nertpinx/libvirt,agx/libvirt