Revert "Revert "common: rename App to ImageName""
Revert "Revert "common: rename App to ImageName""

This reverts commit 06ed1491dee087e5a83984239e8e11577d8a6131.

mclarkson/docker2aci,jsoriano/docker2aci,jonboulle/docker2aci,dgonyeo/docker2aci,appc/docker2aci,dgonyeo/docker2aci,jumpstarter-io/docker2aci,pquerna/docker2aci,OMWAVE/docker2aci,jsoriano/docker2aci,ChengTiesheng/docker2aci,iaguis/docker2aci,vishvananda/docker2aci,OMWAVE/docker2aci,vishvananda/docker2aci,appc/docker2aci