Avoid commit issues with sample credential files

[brianredbeard]

The file sample_auth_check.sh refers to two files which should not be kept in revision control:

• authorized.txt
• logs.txt

This addition to .gitignore keeps those files from accidentally being commited.

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[brianredbeard]

I signed it

[googlebot]

CLAs look good, thanks!

[brianredbeard]

no idea why my CLA disappeared, but it's been re-signed.