libs/gst/net/: Stop reading commands when EOF as well.

libs/gst/net/: Stop reading commands when EOF as well.

Original commit message from CVS:
* libs/gst/net/gstnetclientclock.c: (gst_net_client_clock_thread):
* libs/gst/net/gstnettimeprovider.c:
(gst_net_time_provider_thread):
Stop reading commands when EOF as well.
* plugins/elements/gstfakesink.c: (gst_fake_sink_class_init):
* plugins/elements/gstfakesrc.c: (gst_fake_src_class_init):
* plugins/elements/gstidentity.c: (gst_identity_class_init):
Unify description of the dump property.