Remove Sisimai::Rhost->match()

[azumakuniyuki]

• No longer needed Sisimai::Rhost->match
• Other code improvement in Sisimai::Rhost and Sisimai::Fact

[codecov]

Codecov Report

Attention: Patch coverage is 90.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 85.54%. Comparing base (c3fe9c9) to head (1de687b).

Files	Patch %	Lines
lib/Sisimai/Rhost.pm	87.50%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           5-stable     #529      +/-   ##
============================================
- Coverage     85.54%   85.54%   -0.01%     
============================================
  Files           135      135              
  Lines          6650     6640      -10     
  Branches       1950     1949       -1     
============================================
- Hits           5689     5680       -9     
  Misses          307      307              
+ Partials        654      653       -1     

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[azumakuniyuki]

return undef unless length($remotehost.$domainpart);