Add "rpm" and "formfactor" LUN options to match istgt functionality.

MFC after:	1 week

(cherry picked from commit 7e130945aea37a833c1cb8305b118abc2192b48b)
Fix printing non-terminated strings in devlist XML.

MFC after:	1 week

(cherry picked from commit 0963d8042b3129788a04f3b99596ffeef457dc3f)