Ignore errors running setup-logrotate.sh
Ignore errors running setup-logrotate.sh

Since we cannot be certain that this file will be available everywhere
the agent runs, we need to ignore failures because they are acceptable.

[#162399779](https://www.pivotaltracker.com/story/show/162399779)

Co-authored-by: Belinda Liu <496afffef642eb3807bf00ef2898c80e8c6b937c@pivotal.io>

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