Implement tests for FTP and RSYNC 🔼

Currently only testing HTTP and HTTPS.

reported=2019-06-25 03:04:08

reporter=onefang

priority=low

category=TODO

severity=feature

resolution=open

2019-06-25 03:44:17 onefang: The FTP test should only check for the existence of the file, unless the Integrity and Updated tests are enabled.

Also, should we try downloading via all chosen protocols?