fix: routing rule not applied for DNS Server in TCP:// schema

[digglife]

This PR should fix the problem that routing rule is not applied for DNS Server in TCP:// schema. Related Issue: #1143

Root cause

dest := net.TCPDestination(net.DomainAddress(url.Hostname()), port)

The AddressFamily for the Address in dest here is actually a Domain. During Router's PickRoute process, it will match against the domain list of the router rule, not the IP list, so the routing rule with IP addresses will never be applied.

Fix

use net.ParseAddress instead, it will return the right type automatically.(Although the address here is supposed to be IP address).

[codecov-commenter]

Codecov Report

Merging #1144 (04a0bb9) into master (00908a1) will decrease coverage by 9.27%.
The diff coverage is 40.90%.

@@            Coverage Diff             @@
##           master    #1144      +/-   ##
==========================================
- Coverage   54.09%   44.81%   -9.28%     
==========================================
  Files         294      485     +191     
  Lines       14869    29490   +14621     
==========================================
+ Hits         8043    13217    +5174     
- Misses       5969    14872    +8903     
- Partials      857     1401     +544     

Impacted Files	Coverage Δ
app/browserforwarder/errors.generated.go	0.00% <0.00%> (ø)
app/commander/commander.go	2.04% <ø> (ø)
app/commander/errors.generated.go	0.00% <ø> (ø)
app/commander/outbound.go	0.00% <0.00%> (ø)
app/dispatcher/errors.generated.go	100.00% <ø> (ø)
app/dispatcher/fakednssniffer.go	0.00% <0.00%> (ø)
app/dispatcher/sniffer.go	0.00% <0.00%> (ø)
app/dispatcher/stats.go	42.85% <ø> (ø)
app/dns/errors.generated.go	100.00% <ø> (ø)
app/dns/fakedns/errors.generated.go	0.00% <0.00%> (ø)
... and 503 more

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