Use installDist instead of installApp.
Use installDist instead of installApp.

This removes a deprecation warning:

==> devcluster: The installApp task has been deprecated and is
scheduled to be removed in Gradle 3.0. Please use the installDist
task instead.

Testing Done:
aurorabuild scheduler

Reviewed at https://reviews.apache.org/r/33029/

shahankhatch/aurora,crashlytics/aurora,apache/aurora,apache/aurora,wfarner/aurora,rdelval/aurora,shahankhatch/aurora,thinker0/aurora,thinker0/aurora,kidaa/aurora,rosmo/aurora,kidaa/aurora,protochron/aurora,shahankhatch/aurora,kidaa/aurora,thinker0/aurora,wfarner/aurora,apache/aurora,kidaa/aurora,thinker0/aurora,medallia/aurora,rosmo/aurora,rdelval/aurora,rdelval/aurora,shahankhatch/aurora,wfarner/aurora,apache/aurora,mschenck/aurora,crashlytics/aurora,crashlytics/aurora,rdelval/aurora,medallia/aurora,medallia/aurora,shahankhatch/aurora,protochron/aurora,wfarner/aurora,wfarner/aurora,shahankhatch/aurora,thinker0/aurora,crashlytics/aurora,medallia/aurora,mschenck/aurora,apache/aurora,rosmo/aurora,rosmo/aurora,kidaa/aurora,rdelval/aurora,mschenck/aurora,mschenck/aurora,medallia/aurora,protochron/aurora,rosmo/aurora,crashlytics/aurora,mschenck/aurora,rosmo/aurora,protochron/aurora,rdelval/aurora,protochron/aurora,mschenck/aurora,kidaa/aurora,thinker0/aurora,apache/aurora,wfarner/aurora,medallia/aurora,protochron/aurora,crashlytics/aurora