Compliance: handle HTTP OPTIONS and TRACE requests with asterisk URIs.

Compliance: handle HTTP OPTIONS and TRACE requests with asterisk URIs.

Handle '*' URIs in urlParse(). This allows Squid properly respond to
OPTIONS and TRACE requests with '*' URIs and Max-Forwards value of
zero. Forwarding such requests is out of this change scope and still
does not work because the upstream host and port are not set.

Co-Advisor test cases:
  test_case/rfc2616/options-bodyless-asterisk
  test_case/rfc2616/maxForwardsZero-OPTIONS-asterisk
  test_case/rfc2616/maxForwardsZero-TRACE-asterisk