SHDP-272 change default-yarn-app-classpath

SHDP-272 Rename default-yarn-app-classpath

- Changing all fields, methods and properties
  to rename default-yarn-app-classpath to
  use-default-yarn-classpath. This is due to
  have a need for defaultYarnAppClasspath to keep
  a base setting for classpath content.


SHDP-272 Add default-yarn-app-classpath

- Adding back default-yarn-app-classpath which
  this time means a default base yarn app
  classpath entries.