Can't jack in to more than one bb projects

[ikappaki]

Expected behavior

Should be able to jack in to more than one bb projects

Actual behavior

You can run the command ‘cider-jack-in-clj’ with C-c M-j
error in process sentinel: Could not start nREPL server: Exception in thread "main" java.net.BindException: Address already in use (Bind failed)

Steps to reproduce the problem

1. Create two bb.edn files with {} contents in separate new directories
2. Jack in to the first directory, a bb session is established.
3. Try to jack in to the second directory, the above error is thrown.

This is because the bb nREPL server is always start up on the same port at 1667.

Environment & Version information

any

PR to follow.