mesh: Only block mod_sub if status was requested
mesh: Only block mod_sub if status was requested

Adds a cli_reset to mod_sub if no status response was requested. This
adds a non-blocking mode to the mod_sub calls, matching the behavior of
other cfg_cli functions.

This is port of b0f83d387ab469f5ae6ba2269e6b85b3af7101a6

apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble