CA-216934: forward name_label/description setting to the right hosts
CA-216934: forward name_label/description setting to the right hosts

In SMAPIv3 plugins model, SR should own its own metadata rather than relying on
the central xapi database. As such, the setting of name_lael/description of a
SR should be forwareded to the host where the SR is currently in use.

Signed-off-by: Zheng Li <e351a3eb690a359d8e02cebc130a21bc4c39d357@citrix.com>

jjd27/xen-api,jjd27/xen-api,jjd27/xen-api,jjd27/xen-api,jjd27/xen-api,jjd27/xen-api