tests: turn perl modules into full packages

This helps enforce more modularization and encapsulation. Enable and fix
warnings on a few packages. Also, rename ftp.pm to processhelp.pm si

tests: turn perl modules into full packages

This helps enforce more modularization and encapsulation. Enable and fix
warnings on a few packages. Also, rename ftp.pm to processhelp.pm since
there's really nothing ftp-specific in it.

Ref: #10818

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