6659 nvlist_free(NULL) is a no-op
Reviewed by: Toomas Soome <tsoome@me.com>
Reviewed by: Marcel Telka <marcel@telka.sk>
Approved by: Robert Mustacchi <rm@joyent.com>

6816913 libDCS returns wrong ecache size

6494832 DCS reports zero e-cache on OPL domains.

6464292 OPL DR: DCS daemon crashes while unconfiguring kernel memory, then fails to restart.

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