Has it really been this way forever?  While there, chain
mwexec_bg() throgh mwexec() to avoid duplicated code and
increase error reporting.

daemon(8) will completely detach and keep running so maybe that
will be one step closer to reliable firmware upgrades.

replace xmlrpc server and include example stub, legacy methods not implemented yet. client also needs some work

This reverts commit 30991a0b.
Looks better, but firmware upgrade script changes need to propagate
to the install media first...

... when using the core.git mount hook.  :)

Does not affect the packages/images.