ubuntu: add xfstests build dep
It is really rude to munge a sources.list and not restore it.
Merge pull request #1 from ceph/portability

It is really rude to munge a sources.list and not restore it.
Make sed expressions which operate on URLs easier to read
Use a more specific regex.
Merge pull request #2 from ceph/portability

Don't ruin sources.list files that reference their own mirrors
Gonna need root for that
Merge pull request #3 from ceph/portability

Gonna need root for that
Reduce mira pending sector count. Add check for uncorrect sectors.

Pending sectors pretty much always cause issues so reduced the trip
count down to 1. Also reported_uncorrect usually mirrors 'pending'
sectors but I found a case where it didn't so added a seperate
reported_uncorrect check.
added vim

Signed-off-by: Mark Nelson <mark.nelson@inktank.com>