Disable Metric Writer by Default
Disable Metric Writer by Default

This change disables the metric writer by default.

[resolves #748]

Signed-off-by: Ben Hale <cf6bfba6a9cc3ab14105263f6e4be417b99c9860@pivotal.io>

cloudfoundry/java-buildpack,Appdynamics/java-buildpack,cloudfoundry-community/jboss-buildpack,cloudfoundry-community/tomee-buildpack,cloudfoundry/java-buildpack,Appdynamics/java-buildpack,rakutentech/java-buildpack,cloudfoundry-community/tomee-buildpack,rakutentech/java-buildpack,cloudfoundry-community/jboss-buildpack