Fix 2585 and clean up warning in contributing.rst
setup network when reconnecting to ghost container

Re-adding the line to setup the network when reconnecting to a ghost
container.  It was inadvertently removed by commit
31638ab2ad2a5380d447780f05f7aa078c9421f5.
Fix 2585, rebase to master
Merge pull request #2615 from jpoimboe/ghost-networking-fix

setup network when reconnecting to ghost container
Merge pull request #2590 from metalivedev/2585-addphplib

Fix 2585 and clean up warning in contributing.rst