cifs: add new "Unspecified" securityEnum value
cifs: add new "Unspecified" securityEnum value

Add a new securityEnum value to cover the case where a sec= option
was not explicitly set.

Signed-off-by: Jeff Layton <4376fbf8623cd7b7c0232225289bb91cedc0a27f@redhat.com>
Reviewed-by: Pavel Shilovsky <7cbcbfe495bad5f7f26ddc6bf28ecd9f36b2e347@etersoft.ru>
Signed-off-by: Steve French <51565b4e5841e493fd669866e11ea3c7c0d781cc@gmail.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs