Small bug fixes and cleanup

[rpunnett-bf]

Details

• Created removeBadPathChars in utils.aws to clean any characters that would prevent a file from being written to the operating system
  • To fix a bug where an error occurred when the Caller.UserID contained illegal characters, such as :
• Created BuildAWSPath in utils.aws, which calls removeBadPathChars , and is called from each aws module to set m.AWSProfile by cleaning then concatenating the Caller.Account and Caller.UserID, returning a string
• Modified all Command based functions in cli.aws to:
  • Load the config once with AWSConfigFileLoader, then pass that value to each client created in the command
  • Limit additional STS calls by running AWSWhoami once after PreRun and passing it where needed.
• Fixed a bug in aws.instances.printInstancesUserDataAttributesOnly where, when reporting User Data from instances, a file was being written when no User Data was present; now gives standard notice no data was found
• Minor cleanups of code to homogenize

[sethsec-bf]

This is an amazing PR @rpunnett-bf, thank you!