[core] False positive JT error when JT HA is enabled

After applying HUE-1256 and configuring two JT's in the hue.ini for JT HA:

[hadoop]
[[mapred_clusters]]
[[[default]]]
jobtracker_host=host1
thrift_port=9290
jobtracker_port=8021
submit_to=true
hadoop_mapred_home=HADOOP_MR1_HOME
hadoop_bin=HADOOP_BIN
hadoop_conf_dir=HADOOP_CONF_DIR
security_enabled=true
[[[jtha]]]
jobtracker_host=host2
thrift_port=9290
jobtracker_port=8021
submit_to=true
hadoop_mapred_home=HADOOP_MR1_HOME
hadoop_bin=HADOOP_BIN
hadoop_conf_dir=HADOOP_CONF_DIR
security_enabled=true

The configuration checker in Hue throws an error saying there may be a misconfiguration, unable to contact host[1|2]:9290. Can we fix this as it's confusing. Only throw the error if we can't reach both JT's?