Don't let failure to trust the CA abort the server installation.

This error could result in things not working properly but it should be
relatively easy to fix from the command-line. There is no point in
not installing at all due to this.

ipaserver/install/certs.py

@@ -791,8 +791,11 @@ class CertDB(object):
         if root_nickname[:7] == "Builtin":
             logging.debug("No need to add trust for built-in root CA's, skipping %s" % root_nickname)
         else:
+            try:
                 self.run_certutil(["-M", "-n", root_nickname,
                                    "-t", "CT,CT,"])
+            except ipautil.CalledProcessError, e:
+                logging.error("Setting trust on %s failed" % root_nickname)
 
     def find_server_certs(self):
         p = subprocess.Popen(["/usr/bin/certutil", "-d", self.secdir,