revert to android gradle plugin 1.0.1 until we figure out why

1.2.3 can't produce the automation build type.

Closes #3480
// FREEBIE

build.gradle

@@ -5,7 +5,7 @@ buildscript {
         }
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:1.2.3'
+        classpath 'com.android.tools.build:gradle:1.0.1'
         classpath files('libs/gradle-witness.jar')
     }
 }