[j-nsp] NSM API resources with SRX

[Pavel Lunin]

Only thing I can say is SRX managed with NSM (manually) is a total mess,
much like any other JUNOS device.

To be honest, I don't see much reason to automate SRX management via NSM
except some specific cases of existing NSM infrastructure already automated
for hundreds of ScreenOS/IDP and a couple of JUNOS devices needed to be
added. JUNOS has enough of well documented XML API to automate the process
without NSM. NSM can be set in parallel if needed.