Fix no-such-file test

This test was giving inconsistent results for me before making the
original change, but I can see clearly now that this is the correct
test.
test: cpu profiling now supported on v0.10
Merge pull request #46 from strongloop/feature/fix-cpu-prof-tests

test: cpu profiling now supported on v0.10
Initial import of persisted environment

This commit could almost be a standalone module as is.
Attach environment to commit

Environment is loaded from the Server instance and used for prepare and run.
Add env-set pmctl command

Restart goes through the existing replace mechanism which has been
updated to test for changes in environment. If the environment
variables of the replacement do not match the environment variables
of the current commit, then a hard restart is done instead of a soft
restart or replacement.
Add /env to test app
Upgrade node in Vagrant test VM
test: end-to-end for pmctl env-set