Update check_sftp.py

[maxwbot]

Update for support Password and fix some bugs. Added option to find text in file.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
7 Code Smells

No Coverage information
0.0% Duplication

[lgtm-com]

This pull request introduces 2 alerts when merging 9029c29 into b577b20 - view on LGTM.com

new alerts:

• 2 for Unused import

[HariSekhon]

What is the use case for using a password instead of SSH Key? Is this less secure?

Also, I generally don't change the date and author headers as that is the origin time of the code, which is an important reference point because it gives a clue as to the code's style based on that time frame, I would write this very differently today.

Tbh if I was still using this code and going to be checking for more things like you're going I'd probably just write a new version of this code with paramiko - there is even a long-standing todo about this at the top of the code.