main-bosh-docker: apt-get update before trying to install packages
main-bosh-docker: apt-get update before trying to install packages

[#145876517](https://www.pivotaltracker.com/story/show/145876517)

Signed-off-by: Luan Santos <509a85c757dc22c0257f4655fb3fb682d42f965b@pivotal.io>

barthy1/bosh,barthy1/bosh,barthy1/bosh,barthy1/bosh