Use ubuntu image with pre-installed java 8 for IT docker (#4970)
Use ubuntu image with pre-installed java 8 for IT docker (#4970)

* Use OpenJDK8 instead of Oracle for IT docker

* install wget

* Use different docker image

* Revert "Use different docker image"

This reverts commit 5786c03cb49d0ac60a4f06690e483c3284fe4564.

* Revert "install wget"

This reverts commit 8d1d5ec681301f2919b9d994e65e4d436f948a72.

* Revert "Use OpenJDK8 instead of Oracle for IT docker"

This reverts commit 55ea163bb530b1e88c2cccd647f89d75ac90393a.

* Use prebuilt java8 image

* Add comment on docker image

liquidm/druid,pjain1/druid,monetate/druid,deltaprojects/druid,monetate/druid,Fokko/druid,pjain1/druid,implydata/druid,nishantmonu51/druid,druid-io/druid,nishantmonu51/druid,b-slim/druid,metamx/druid,taochaoqiang/druid,mghosh4/druid,liquidm/druid,druid-io/druid,himanshug/druid,leventov/druid,gianm/druid,gianm/druid,jon-wei/druid,andy256/druid,dkhwangbo/druid,liquidm/druid,Fokko/druid,jon-wei/druid,gianm/druid,metamx/druid,Fokko/druid,taochaoqiang/druid,knoguchi/druid,jon-wei/druid,deltaprojects/druid,andy256/druid,mghosh4/druid,andy256/druid,nishantmonu51/druid,metamx/druid,monetate/druid,himanshug/druid,michaelschiff/druid,dkhwangbo/druid,jon-wei/druid,dkhwangbo/druid,pjain1/druid,deltaprojects/druid,mghosh4/druid,andy256/druid,mghosh4/druid,liquidm/druid,b-slim/druid,jon-wei/druid,gianm/druid,liquidm/druid,liquidm/druid,monetate/druid,dkhwangbo/druid,mghosh4/druid,gianm/druid,dkhwangbo/druid,implydata/druid,winval/druid,michaelschiff/druid,knoguchi/druid,Fokko/druid,Fokko/druid,michaelschiff/druid,leventov/druid,jon-wei/druid,nishantmonu51/druid,monetate/druid,pjain1/druid,winval/druid,b-slim/druid,michaelschiff/druid,winval/druid,monetate/druid,implydata/druid,implydata/druid,druid-io/druid,taochaoqiang/druid,metamx/druid,winval/druid,pjain1/druid,nishantmonu51/druid,michaelschiff/druid,himanshug/druid,leventov/druid,nishantmonu51/druid,deltaprojects/druid,himanshug/druid,jon-wei/druid,druid-io/druid,Fokko/druid,gianm/druid,druid-io/druid,taochaoqiang/druid,implydata/druid,winval/druid,b-slim/druid,monetate/druid,mghosh4/druid,himanshug/druid,nishantmonu51/druid,deltaprojects/druid,mghosh4/druid,michaelschiff/druid,michaelschiff/druid,gianm/druid,metamx/druid,pjain1/druid,implydata/druid,knoguchi/druid,deltaprojects/druid,andy256/druid,taochaoqiang/druid,deltaprojects/druid,Fokko/druid,knoguchi/druid,leventov/druid,pjain1/druid,leventov/druid,knoguchi/druid,b-slim/druid