hpcloud: node setup fails due to: *** /dev/vdb appears to already be mounted

http://logs.openstack.org/96/202196/1/check/gate-tempest-dsvm-full/053824a/logs/devstack-gate-setup-workspace-new.txt.gz#_2015-07-15_17_33_38_886

localhost | FAILED | rc=1 >>
2015-07-15 17:33:38.870 | + '[' -z master ']'
2015-07-15 17:33:38.871 | + fix_disk_layout
2015-07-15 17:33:38.873 | ++ grep SwapTotal /proc/meminfo
2015-07-15 17:33:38.874 | ++ awk '{ print $2; }'
2015-07-15 17:33:38.876 | + '[' 0 -eq 0 ']'
2015-07-15 17:33:38.877 | + '[' -b /dev/vdb ']'
2015-07-15 17:33:38.878 | + DEV=/dev/vdb
2015-07-15 17:33:38.879 | + '[' -n /dev/vdb ']'
2015-07-15 17:33:38.880 | + local swap=/dev/vdb1
2015-07-15 17:33:38.881 | + local lvmvol=/dev/vdb2
2015-07-15 17:33:38.883 | + local optdev=/dev/vdb3
2015-07-15 17:33:38.884 | + mount
2015-07-15 17:33:38.885 | + grep /dev/vdb
2015-07-15 17:33:38.886 | + echo '*** /dev/vdb appears to already be mounted'
2015-07-15 17:33:38.887 | *** /dev/vdb appears to already be mounted
2015-07-15 17:33:38.888 | + mount
2015-07-15 17:33:38.889 | /dev/vda1 on / type ext4 (rw)
2015-07-15 17:33:38.890 | proc on /proc type proc (rw,noexec,nosuid,nodev)
2015-07-15 17:33:38.891 | sysfs on /sys type sysfs (rw,noexec,nosuid,nodev)
2015-07-15 17:33:38.893 | none on /sys/fs/cgroup type tmpfs (rw)
2015-07-15 17:33:38.894 | none on /sys/fs/fuse/connections type fusectl (rw)
2015-07-15 17:33:38.895 | none on /sys/kernel/debug type debugfs (rw)
2015-07-15 17:33:38.896 | none on /sys/kernel/security type securityfs (rw)
2015-07-15 17:33:38.897 | udev on /dev type devtmpfs (rw,mode=0755)
2015-07-15 17:33:38.898 | devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=0620)
2015-07-15 17:33:38.899 | tmpfs on /run type tmpfs (rw,noexec,nosuid,size=10%,mode=0755)
2015-07-15 17:33:38.901 | none on /run/lock type tmpfs (rw,noexec,nosuid,nodev,size=5242880)
2015-07-15 17:33:38.902 | none on /run/shm type tmpfs (rw,nosuid,nodev)
2015-07-15 17:33:38.903 | none on /run/user type tmpfs (rw,noexec,nosuid,nodev,size=104857600,mode=0755)
2015-07-15 17:33:38.904 | none on /sys/fs/pstore type pstore (rw)
2015-07-15 17:33:38.905 | systemd on /sys/fs/cgroup/systemd type cgroup (rw,noexec,nosuid,nodev,none,name=systemd)
2015-07-15 17:33:38.906 | /dev/vdb on /mnt type ext3 (rw,_netdev)
2015-07-15 17:33:38.907 | + return 1

Fixed here: https://review.openstack.org/#/c/202217/