Various improvements to the resolv test suite
    
    * The resolv test case can now test for TXT and SRV resolving by
      specifying -t host and -s host respectively. The -n flag must still be
      passed in to enable network tests.
    * Added test for the little complicated resolv_copy_hostent() function.
    * Leak checking using the new tests common functions.
    * Fix indentation for test_internet, since the whole function was
      modified to be able to handle SRV and TXT replies.
    * Initialize the debug variable in main().
    
    Also removed one unused variable in krb5_utils-tests.c