Change error string if aws config path is changed

[lukemassa]

The code respects AWS_CONFIG_FILE but the error message for missing profile doesn't show that.

This also makes the error message for the default config file show the file with its absolute path, which seems fine to me but I wanted to call out as a change in behavior.

Before:

LMASSA-MAC:aws2wrap luke$ python3 __init__.py --profile default
LMASSA-MAC:aws2wrap luke$ python3 __init__.py --profile nonexistentprofile
Cannot find profile 'nonexistentprofile' in ~/.aws/config
LMASSA-MAC:aws2wrap luke$ AWS_CONFIG_FILE=/path/to/non/existent/file python3 __init__.py --profile default
Cannot find profile 'default' in ~/.aws/config

After:

LMASSA-MAC:aws2wrap luke$ python3 __init__.py --profile default
LMASSA-MAC:aws2wrap luke$ python3 __init__.py --profile nonexistentprofile
Cannot find profile 'nonexistentprofile' in /Users/luke/.aws/config
LMASSA-MAC:aws2wrap luke$ AWS_CONFIG_FILE=/path/to/non/existent/file python3 __init__.py --profile default
Cannot find profile 'default' in /path/to/non/existent/file

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!

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[pcolmer]

Thanks, @lukemassa, for your contribution.