Use regexp.MustCompile() as recommended by Caleb.

https://github.com/tobert/gdsh/commit/7c3507f1e69a5e733abb6b3eb9e6253ecfa674a5#commitcomment-2691146
These files are now in the 'gdssh' package.
Check in nearly-working gdssh package.

Lots of work all over these. Things are pretty darn close to
working the way I want with the last step being getting the
actual command to run. Scp works, just the session for running
fails for some reason.

* switched back to goroutine proxies for stdio
* filled in a bunch of code
* added Task interface for Pool.All / Pool.AllSerial
Change run.go over to the new gdssh package.
go fmt
rename file
remove dead code
parse addr:port, add hostPortMap()
remove dead code
go fmt
add sshPool() helper
Move misplaced sess.Close(). It's ALIVE!