Skip gate FS optimization if no secondary disk

This commit removes the assumption that all gate nodes have a secondary
disk, and skip tuning the filesystem if the node doesn't have one.

This fixes gate failures on OVH nodes.

Closes-Bug: #1525047

Change-Id: Ief22f34b32caf7a8b446df888fc5cc1964ad272e

tests/setup_Debian.sh

@@ -14,6 +14,8 @@ sudo apt-key adv --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys 58
 sudo apt-get update
 sudo apt-get install -y --no-install-recommends docker-engine=1.8.2-0~trusty btrfs-tools
 
+# Only do FS optimization if we have a secondary disk
+if [[ -b /dev/${DEV} ]]; then
     # The reason for using BTRFS is stability. There are numerous issues with the
     # devicemapper backed on Ubuntu and AUFS is slow. BTRFS is very solid as a
     # backend in my experince. I use ie almost exclusively.
@@ -33,6 +35,7 @@ sudo umount /var/lib/docker
     sudo mount -o noatime,compress=lzo,space_cache,subvol=docker /dev/${DEV} /var/lib/docker
 
     sudo service docker start
+fi
 
 sudo docker info
 

tests/setup_RedHat.sh

@@ -19,6 +19,8 @@ EOF
 
 sudo yum install -y libffi-devel openssl-devel docker-engine-1.8.2 xfsprogs
 
+# Only do FS optimization if we have a secondary disk
+if [[ -b /dev/${DEV} ]]; then
     # Setup backing disk for use with Docker. This is to ensure we use the ephemeral
     # disk provided to the build instance. It ensures the correct disk and storage
     # driver are used for Docker. It is recommend to use the thin provisioning
@@ -35,6 +37,8 @@ yes | sudo lvconvert --type thin-pool --poolmetadata kolla01/thin01meta kolla01/
     # Setup Docker
     sudo sed -i -r 's,(ExecStart)=(.+),\1=/usr/bin/docker daemon --storage-driver devicemapper --storage-opt dm.fs=xfs --storage-opt dm.thinpooldev=kolla01-thin01 --storage-opt dm.use_deferred_removal=true,' /usr/lib/systemd/system/docker.service
     sudo systemctl daemon-reload
+fi
+
 sudo systemctl start docker
 sudo docker info