remove html tag in timeout error message (#4447)
remove html tag in timeout error message (#4447)


zhouyao1994/incubator-superset,apache/incubator-superset,dmigo/incubator-superset,airbnb/caravel,dmigo/incubator-superset,airbnb/superset,timifasubaa/incubator-superset,apache/incubator-superset,mistercrunch/panoramix,zhouyao1994/incubator-superset,timifasubaa/incubator-superset,airbnb/superset,apache/incubator-superset,timifasubaa/incubator-superset,airbnb/caravel,zhouyao1994/incubator-superset,apache/incubator-superset,airbnb/caravel,airbnb/superset,dmigo/incubator-superset,timifasubaa/incubator-superset,apache/incubator-superset,zhouyao1994/incubator-superset,zhouyao1994/incubator-superset,dmigo/incubator-superset,mistercrunch/panoramix,mistercrunch/panoramix,airbnb/superset,airbnb/caravel,mistercrunch/panoramix