Add Error and Retry handling

[rtisma]

Currently, there is no specific error handling process. For example, errors are not displayed in red.

The following are some guidelines for how things should be displayed

• Errors should be in Red
• Errors should be simple one liners, no stack trace dumps
• Errors should be descriptive
• Errors should have exit code != 0
• All exceptions should be intercepted and converted to an displayable error

Update: Docker commands are just deployed without any error handling or recovery mechanism. In order to present the errors, they need to be handled first, with both retry and propagating errors. Some of the things that need error handing:

• deploying containers
  • incorrect or incompatible configs
  • incorrect template files
  • violating validation contraints on configs

[b-f-chan]

Can do at end once entire installer done

[b-f-chan]

Limit scope/constraint checking:

• Checking port availability
• Checking container sucessfully deployed
• Retry handling is done by swarm already - Need to indicate to client # of retries and messaging around this