devel/fb-adb: add new port
Differential Revision: https://reviews.freebsd.org/D3930
fb-adb is a tool for interacting with Android systems. It does much of
what adb does, but with better remote shell support and, hopefully,
fewer bugs. Differences between adb and fb-adb are that fb-adb:
- is binary clean (no LF -> CRLF mangling)
- transmits and updates window size
- distinguishes standard output and standard error
- properly muxes streams with independent flow control
- allows for ssh-like pty allocation control
- propagates program exit status instead of always exiting with status 0
- properly escapes program arguments
- kills remote program
- provides a generic facility to elevate to root without re-escaping