Exclude unrelated code from gradleBuildSmokeTest
Exclude unrelated code from gradleBuildSmokeTest

gradleBuildSmokeTest aims at testing gradle build logic,
so we exclude source code - the quality of source code is guaranteed
by other tasks.

gradle/gradle,blindpirate/gradle,gradle/gradle,gradle/gradle,gradle/gradle,gradle/gradle,gradle/gradle,blindpirate/gradle,blindpirate/gradle,blindpirate/gradle,blindpirate/gradle,blindpirate/gradle,gradle/gradle,gradle/gradle,blindpirate/gradle,gradle/gradle,blindpirate/gradle,blindpirate/gradle,gradle/gradle,blindpirate/gradle