Removed __time column from druid metadata refresh, added long and double schema support (#2911)
Removed __time column from druid metadata refresh, added long and double schema support (#2911)

* Removed __time column from load, added long/double schema support

* Format fix

apache/incubator-superset,FrederichCheng/incubator-superset,mistercrunch/panoramix,alanmcruickshank/superset-dev,zhouyao1994/incubator-superset,airbnb/caravel,timifasubaa/incubator-superset,mistercrunch/panoramix,dmigo/incubator-superset,FrederichCheng/incubator-superset,dmigo/incubator-superset,timifasubaa/incubator-superset,dmigo/incubator-superset,SingTel-DataCo/incubator-superset,zhouyao1994/incubator-superset,massgov/incubator-superset,zhouyao1994/incubator-superset,airbnb/caravel,zhouyao1994/incubator-superset,airbnb/caravel,BRD-CD/superset,alanmcruickshank/superset-dev,nekia/incubator-superset-dev,SingTel-DataCo/incubator-superset,nekia/incubator-superset-dev,apache/incubator-superset,SingTel-DataCo/incubator-superset,airbnb/superset,airbnb/superset,nekia/incubator-superset-dev,asdf2014/superset,mistercrunch/panoramix,FrederichCheng/incubator-superset,massgov/incubator-superset,mistercrunch/panoramix,zhouyao1994/incubator-superset,massgov/incubator-superset,timifasubaa/incubator-superset,apache/incubator-superset,BRD-CD/superset,BRD-CD/superset,apache/incubator-superset,asdf2014/superset,massgov/incubator-superset,airbnb/superset,dmigo/incubator-superset,alanmcruickshank/superset-dev,timifasubaa/incubator-superset,FrederichCheng/incubator-superset,airbnb/caravel,asdf2014/superset,apache/incubator-superset,SingTel-DataCo/incubator-superset,BRD-CD/superset,asdf2014/superset,nekia/incubator-superset-dev,airbnb/superset,alanmcruickshank/superset-dev