Adding option to skip remaining paths on unresponsive host

[Mzack9999]

Example use:-

httpx -l subs.txt -paths apis.txt -max-host-error 10

This will discard all the hosts from subs.txt given the host errored about 10 times, as default this feature is disabled.

Following errors are considered to count for max-host-error flag.

"no address found for host"
"no address found for host (Client.Timeout exceeded while awaiting headers)"
"context deadline exceeded (Client.Timeout exceeded while awaiting headers)"

[ehsandeep]

Currently supported errors

• "no address found for host"
• "no address found for host (Client.Timeout exceeded while awaiting headers)"
• "context deadline exceeded (Client.Timeout exceeded while awaiting headers)"

[Mzack9999]

@ehsandeep This should be already covered:

ncat -klvp 1000

[DBG] Failed 'http://localhost:1000/aaa': GET http://localhost:1000/aaa giving up after 1 attempts: Get "http://localhost:1000/aaa": context deadline exceeded (Client.Timeout exceeded while awaiting headers)
[DBG] Failed 'localhost:1000': skipping as previously unresponsive
[DBG] Failed 'localhost:1000': skipping as previously unresponsive
[DBG] Failed 'localhost:1000': skipping as previously unresponsive
[DBG] Failed 'localhost:1000': skipping as previously unresponsive
[DBG] Failed 'localhost:1000': skipping as previously unresponsive
[DBG] Failed 'localhost:1000': skipping as previously unresponsive
[DBG] Failed 'localhost:1000': skipping as previously unresponsive
[DBG] Failed 'localhost:1000': skipping as previously unresponsive
[DBG] Failed 'localhost:1000': skipping as previously unresponsive