mesh: Silence proxy not connected log
mesh: Silence proxy not connected log

When performing node reset over a proxy connection, the disconnection is
asynchronous, and will finish after the reset callback goes to the
application. If the application restarts provisioning in this callback,
the disconnected-event is triggered after PB GATT is reactivated, and
this error is printed without any faults actually occurring.

this is port of 82d941069885f7654295c8f5e4bd41cfe72bb131

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