Add post-upgrade script

[hobinjk]

Fix #632. Progresses forward on #641 but the zwave issue needs
consideration.

[codecov-io]

Codecov Report

Merging #814 into master will decrease coverage by 0.63%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #814      +/-   ##
==========================================
- Coverage   77.74%   77.11%   -0.64%     
==========================================
  Files          87       87              
  Lines        3721     3762      +41     
  Branches      497      501       +4     
==========================================
+ Hits         2893     2901       +8     
- Misses        760      789      +29     
- Partials       68       72       +4

Impacted Files	Coverage Δ
src/controllers/new_things_controller.js	43.75% <0%> (-31.25%)	⬇️
src/controllers/things_controller.js	82.8% <0%> (-10.49%)	⬇️
src/addon-manager.js	62.06% <0%> (-0.06%)	⬇️

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[mrstegeman]

@hobinjk Could you add the following to post-upgrade.sh, please?

# Upgrade gateway-addon Python package
_url="git+https://github.com/mozilla-iot/gateway-addon-python#egg=gateway_addon"
sudo pip2 install -U "$_url"
sudo pip3 install -U "$_url"

[hobinjk]

@mrstegeman Updated accordingly

[mrstegeman]

Thanks! Are we worried about this messing things up if the update is rolled back?

[hobinjk]

The node update will cause issues if the update fails. This can be resolved if we want to create an 0.3.2 release with nvm alias default v7.10.1 in upgrade-rollback.sh. I'm not sure if we are that concerned at this stage but we should attempt to limit this script to backwards-compatible changes in the future.

[hobinjk]

Oh wait, the rollback script used is actually this one. I'll update accordingly