CI cleanup failure

[Nir Soffer]

This ioprocess build failed with ci related issue:

http://jenkins.ovirt.org/job/ioprocess_master_build-artifacts-el7-x86_64/1/

12:18:34 + mounts=($(mount | awk '{print $3}' | grep "$mock_root"))
12:18:34 ++ mount
12:18:34 ++ awk '{print $3}'
12:18:34 ++ grep /var/lib/mock/fedora-22-x86_64-d496d3daa673001f46dbbd9addf9ba1b
12:18:34 + [[ -n
/var/lib/mock/fedora-22-x86_64-d496d3daa673001f46dbbd9addf9ba1b/root/proc
]]
12:18:34 + echo 'Found mounted dirs inside the chroot
/var/lib/mock/fedora-22-x86_64-d496d3daa673001f46dbbd9addf9ba1b.'
'Trying to umount.'
12:18:34 Found mounted dirs inside the chroot
/var/lib/mock/fedora-22-x86_64-d496d3daa673001f46dbbd9addf9ba1b.
Trying to umount.
12:18:34 + for mount in '"${mounts[@]}"'
12:18:34 + sudo umount
/var/lib/mock/fedora-22-x86_64-d496d3daa673001f46dbbd9addf9ba1b/root/proc
12:18:34 umount:
/var/lib/mock/fedora-22-x86_64-d496d3daa673001f46dbbd9addf9ba1b/root/proc:
target is busy.
12:18:34         (In some cases useful info about processes that use
12:18:34          the device is found by lsof(8) or fuser(1))
12:18:34 + echo 'ERROR:  Failed to umount
/var/lib/mock/fedora-22-x86_64-d496d3daa673001f46dbbd9addf9ba1b/root/proc.'
12:18:34 ERROR:  Failed to umount
/var/lib/mock/fedora-22-x86_64-d496d3daa673001f46dbbd9addf9ba1b/root/proc.

We should check why the mountpoint is busy, but a quick fix may be using
the --lazy option:

    umount --lazy /mountpoint

Nir