myproxy: invalid certificate hostname check

From the MyProxy advisory:

The myproxy-logon program (also called myproxy-get-delegation) in MyProxy versions 5.0 through 5.2 does not abort connections when it finds that the myproxy-server's certificate is valid and signed by a trusted certification authority but the certificate does not contain the expected hostname (or identity given in the MYPROXY_SERVER_DN environment variable), unless the myproxy-logon -T or myproxy-logon -b options are given.