JCLOUDS-153 remove IO Executor and usage of it.
JCLOUDS-40 unasync Fallback
Overriding modernizer-plugin config in jclouds-resources

This fixes a self-dependency
Moving checkstyle-plugin config to profiles
Overriding checkstyle-plugin config in jclouds-resources

Otherwise, fails with a self-dependency
Revert "JCLOUDS-736: Revert "Fail build on checkstyle warnings""

This reverts commit 80d51f409aa36f1a5505214eb4ac6e1128213c92.