Position neubot on 0.4.16.3

This is the starting point for releasing new Neubots for M-Lab
in the coming days.

To start off, I will keep my changes private (i.e., I won't push
to upstream) for one-two more days, and do more testing on the
test-only subset of M-Lab servers.
Merge remote-tracking branch 'm-lab-tools/master'
README.md: remind myself about the yum command to get devtools
Start testing 0.4.16.4
Add deploy.sh: script to manually deploy the RPM on M-Lab
Update neubot to point to the real 0.4.16.4 tag
add check.sh: initial script to check the deployment result
Point neubot's tip to 0.4.16.7
deploy.sh: stop the old version before we update the rpm
deploy.sh: remove the rpm file when done
Merge branch 'test_0.4.16.x'