fix browser auth issue, multiple roles, and make role to assume more flexible

[jeremyplichtafc]

Problem Statement

• The javafx window remains open and never shuts down once user authenticates (Java opens console instead of reverting to shell #317)
• Multiple roles are not handles correctly due to order of roleArn and principal being incorrect in map (this reverts previous change ecbf26e#diff-13509f60aa8d183ec80dc2582dc38e74R49)
• I would like more flexibility for the OKTA_AWS_ROLE_TO_ASSUME env variable to be a full arn or just a name since in my scenario we are wrapping this tool and supporting multiple accounts and roles

Solution

• check for relative path in form /saml
• fix order of role arn map
• modify code that selects role to check OKTA_AWS_ROLE_TO_ASSUME match on role arn or role name

[jeremyplichtafc]

@mraible or @AlainODea - can one of you take a look at this and let me know if it can be merged? This fixes #317 which is preventing the current version of this project working for anyone that uses web browser authentication. Thanks!

[AlainODea]

Thank you for your contribution, @jeremyplichtacfc. I have not been maintaining this project, but this is a straight-forward, good change and I didn’t want it to sit unmerged.

[jeremyplichtafc]

Thanks @AlainODea for coming out of ofka-aws-cli retirement temporarily to merge this 😄
Is @mraible the only one that can cut a new release?