mesh: shell: Make Static OOB optional
mesh: shell: Make Static OOB optional

Having the Static OOB value set up-front can be confusing to the user
since they will not know what the value is. Start off by having it
unset, but introduce a new command using which the user can either set
or clear it.

X-Original-Commit: 7f440b9891eec185dcefaf3940841758ec90118d

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