Use eclipse-wtp instead of eclipse in java projects

gradle/javaprojects.gradle

@@ -1,5 +1,5 @@
 apply plugin: 'java'
-apply plugin: 'eclipse'
+apply plugin: 'eclipse-wtp'
 apply plugin: 'propdeps'
 apply plugin: 'propdeps-maven'
 apply plugin: 'propdeps-idea'