Ensure that hostname comparisons are not case sensitive.
Ensure that hostname comparisons are not case sensitive.

By definition, hostnames should not be case sensitive:

https://tools.ietf.org/html/rfc4343

This fixes issue #4167.

mnaiman/duplicati,duplicati/duplicati,mnaiman/duplicati,duplicati/duplicati,duplicati/duplicati,mnaiman/duplicati,duplicati/duplicati,mnaiman/duplicati,mnaiman/duplicati,duplicati/duplicati