DNS check on startup takes forever to time out

[rmccue]

When using a DNS server that poisons loopback (127.0.0.1) resolution (i.e. to block DNS rebinding attacks), the DNS resolution check takes a long time before erroring out. We should lower this threshold - DNS should resolve nearly instantly.

Steps to reproduce:

1. Use a DNS server which blocks loopback resolution
   1. If you don't have one already, go to NextDNS and hit "try it now"
   2. Go to Security > DNS Rebinding Protection and enable it
   3. Go back to Setup and hit "Link IP" on the right hand side
   4. Use the DNS server IPs provided
   5. Verify failing lookup by using dig test.altis.dev - you should see OPT=15: 00 11 42 6c 6f 63 6b 65 64 20 62 79 20 4e 65 78 74 44 4e 53 ("..Blocked by NextDNS")
2. composer server start
3. Observe wait time for DNS resolution after startup

Acceptance criteria:

• ...

[rmccue]

Related: https://stackoverflow.com/questions/39044855/execute-gethostbyname-for-maximum-1-second

[rmccue]

Looks like the culprit is the fact we run it in a loop:

altis-local-server/inc/composer/class-command.php

Lines 996 to 1006 in 358ef34

	$failed = [];
	foreach ( $domains as $domain ) {
	$ip = gethostbyname( $domain );
	if ( $ip === $domain ) {
	$failed[] = $domain;
	}
	}
	if ( ! $failed ) {
	return;
	}