Add /memz and /threadz debug pages to catalog server
Add /memz and /threadz debug pages to catalog server

Change-Id: Ie95699b2973991dd93c20dcca7c7d3f2d95af850
Reviewed-on: http://gerrit.ent.cloudera.com:8080/1593
Reviewed-by: Henry Robinson <3eca10f30041813f045165784e24b5a950a6cc7e@cloudera.com>
Tested-by: jenkins

placrosse/ImpalaToGo,ImpalaToGo/ImpalaToGo,andybab/Impala,rampage644/impala-cut,andybab/Impala,gistic/PublicSpatialImpala,ImpalaToGo/ImpalaToGo,placrosse/ImpalaToGo,ImpalaToGo/ImpalaToGo,ImpalaToGo/ImpalaToGo,gistic/PublicSpatialImpala,gistic/PublicSpatialImpala,AtScaleInc/Impala,AtScaleInc/Impala,rampage644/impala-cut,placrosse/ImpalaToGo,AtScaleInc/Impala,andybab/Impala,AtScaleInc/Impala,rampage644/impala-cut,rampage644/impala-cut,ImpalaToGo/ImpalaToGo,gistic/PublicSpatialImpala,rampage644/impala-cut,gistic/PublicSpatialImpala,gistic/PublicSpatialImpala,placrosse/ImpalaToGo,andybab/Impala,andybab/Impala,placrosse/ImpalaToGo,placrosse/ImpalaToGo,AtScaleInc/Impala,rampage644/impala-cut,AtScaleInc/Impala,andybab/Impala,ImpalaToGo/ImpalaToGo