bump to loggregator emitter to version 2.0.1

* this has better error handling when using an unresolvable hostname
* added a unit test to verify proper loggregator config and error messages while bootstrapping
Make host explicitly bad in failure spec for loggregator emitter

Signed-off-by: Casey McTaggart <cmctaggart@pivotallabs.com>
update loggregator emitter lib

* lib fixes DNS resolution with multiple ips for a given hostname
bump loggregator emitter gem

* properly handle empty host names

Signed-off-by: Casey McTaggart <cmctaggart@pivotallabs.com>
Auto-merge remote-tracking branch 'upstream/master'