webrick: compile RE correctly for beginning and end match

Using ^ and $ in regexps means we can accidentally get fooled
by "%0a" in HTTP request paths being decoded to newline
characters.  Use \A and \z to match beginning and end-of-string
respectively, instead.

Thanks to mame and hsbt for reporting.

* lib/webrick/httpserver.rb (MountTable#compile):
  use \A and \z instead of ^ and $
* lib/webrick/httpserver.rb (MountTable#normalize): use \z instead of $
* test/webrick/test_httpserver.rb (test_cntrl_in_path): new test

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61197 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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