CA-33741: deprecate VM.update_snapshot_metadata.
CA-33741: deprecate VM.update_snapshot_metadata.

This call was used during import-metadata and pool-join, but not anymore as this bit of code was refactored a long time ago.

Signed-off-by: Thomas Gazagnaire <d17b540e4bd20a6d2c62b93674760725b3f75517@citrix.com>

vasilenkomike/xen-api,rafalmiel/xen-api,srowe/xen-api,cheng-z/xen-api,simonjbeaumont/xen-api,anoobs/xen-api,jjd27/xen-api,Frezzle/xen-api,djs55/xen-api,vasilenkomike/xen-api,djs55/xen-api,ravippandey/xen-api,robertbreker/xen-api,djs55/xen-api,agimofcarmen/xen-api,huizh/xen-api,vasilenkomike/xen-api,thomassa/xen-api,simonjbeaumont/xen-api,simonjbeaumont/xen-api,robertbreker/xen-api,djs55/xen-api,rafalmiel/xen-api,robertbreker/xen-api,Frezzle/xen-api,djs55/xen-api,koushikcgit/xen-api,thomassa/xen-api,cheng-z/xen-api,rafalmiel/xen-api,srowe/xen-api,agimofcarmen/xen-api,salvocambria/xen-api,thomassa/xen-api,cheng--zhang/xen-api,cheng-z/xen-api,anoobs/xen-api,anoobs/xen-api,agimofcarmen/xen-api,thomassa/xen-api,salvocambria/xen-api,cheng--zhang/xen-api,jjd27/xen-api,salvocambria/xen-api,ravippandey/xen-api,euanh/xen-api,cheng-z/xen-api,koushikcgit/xen-api,jjd27/xen-api,huizh/xen-api,huizh/xen-api,anoobs/xen-api,guard163/xen-api,simonjbeaumont/xen-api,rafalmiel/xen-api,huizh/xen-api,guard163/xen-api,djs55/xen-api,Frezzle/xen-api,cheng-z/xen-api,huizh/xen-api,ravippandey/xen-api,vasilenkomike/xen-api,robertbreker/xen-api,koushikcgit/xen-api,guard163/xen-api,jjd27/xen-api,cheng--zhang/xen-api,simonjbeaumont/xen-api,Frezzle/xen-api,guard163/xen-api,salvocambria/xen-api,rafalmiel/xen-api,vasilenkomike/xen-api,euanh/xen-api,agimofcarmen/xen-api,srowe/xen-api,anoobs/xen-api,thomassa/xen-api,cheng-z/xen-api,koushikcgit/xen-api,ravippandey/xen-api,cheng--zhang/xen-api,srowe/xen-api,euanh/xen-api,thomassa/xen-api,euanh/xen-api,salvocambria/xen-api,euanh/xen-api,koushikcgit/xen-api,agimofcarmen/xen-api,simonjbeaumont/xen-api,cheng-z/xen-api,cheng--zhang/xen-api,ravippandey/xen-api,anoobs/xen-api,jjd27/xen-api,salvocambria/xen-api,vasilenkomike/xen-api,guard163/xen-api,huizh/xen-api,agimofcarmen/xen-api,euanh/xen-api,jjd27/xen-api,robertbreker/xen-api,srowe/xen-api,Frezzle/xen-api,ravippandey/xen-api,cheng--zhang/xen-api,guard163/xen-api,rafalmiel/xen-api,koushikcgit/xen-api,cheng--zhang/xen-api,robertbreker/xen-api