Track os in etc/operating_system

* Like etc/infrastructure
* To be used to start agent with correct platform
* [#54321040]

Signed-off-by: Abhijit Hiremagalur <abhi@pivotallabs.com>
Make mount retry work

* exception message was incorrect
* need to wait a split second for retry to be effective

Signed-off-by: Jeffrey Peckham <peckham@pivotallabs.com>