Fix "D-Bus library appears to be incorrectly set up;" error

[rosswhitfield]

We are trying to use the CentOS7 docker image mantidproject/jenkins-node:centos7 for our build servers and when running the tests a lot fail with the message

libEGL warning: DRI2: failed to open swrast (search paths /usr/lib64/dri)
D-Bus library appears to be incorrectly set up; failed to read machine uuid: UUID file '/etc/machine-id' should contain a hex string of length 32, not length 0, with no other text
See the manual page for dbus-uuidgen to correct this issue.

This can happen when xorg is installed on a barebones system (like docker) as things don't get set up correctly.

This should fix that.

[martyngigg]

I'll rebuild the images. The development package version needed updating too so I've done that.