V0.5.2 - Fixes version

1. fix for #2070 - use only error code 68 for duplicate flag
2. Temporary fix for nodes monitor (ignore start if already started)
3. fix for #2081 - windows one liner is wrong
4. fix for #2077 - ignoring Azure temporary storage (currently by label only, need to find a better way to do it). please don't close the bug.

https://goo.gl/hC5Q3F - 0.5.2 document for azure

https://goo.gl/x3ZGeX - 0.5.2 ova

https://goo.gl/Ro0wJb - 0.5.2 document