Validate IPs and hostnames

[jimaek]

It seems we try to ping IPs like 800.800.80.80 and we just get a measurement stuck in in-progress.
Same for hostnames like dfdf

Validate IPs and hostnames to make sure they are valid

[patrykcieszkowski]

is that really an issue? Worst case scenario it will just fail, the timeout will deal with the staus

[jimaek]

It will fail after 30 seconds but its still a bad experience. We will take credits from the user for a failed test that we could have known that it will fail by simply running the input through some validation library.

[zarianec]

I believe I even left a todo comment for that :) The issue with it is that this field accepts both up and hostnames so validation must apply to both.