Relax disk size expectations in test
Relax disk size expectations in test

[#167583141]

Co-authored-by: Merric de Launey <79964dcbacbf8006d1234555614dad3bcf49e6d6@pivotal.io>

cloudfoundry/bosh-agent,mattcui/bosh-agent,gu-bin/bosh-agent,gu-bin/bosh-agent,mattcui/bosh-agent,gu-bin/bosh-agent,cloudfoundry/bosh-agent,mattcui/bosh-agent