Safely create directories

This prevents failure when the directory already exists.

This commit fixes a failure in centos-binary because of a change in the
RDO packaging, where the required directory is now created for us.

Change-Id: Idd3e15802c3e3fd363e1295111ec12948d566781
Closes-Bug: #1543417

docker/dind/start.sh

@@ -11,7 +11,7 @@ done
 docker daemon -s btrfs 2>&1 > docker.log &
 docker_pid=$!
 
-mkdir /var/run/sshd
+mkdir -p /var/run/sshd
 /usr/sbin/sshd -D 2>&1 > sshd.log &
 sshd_pid=$!
 

docker/nova/nova-compute/extend_start.sh

@@ -4,6 +4,10 @@
 # of the KOLLA_BOOTSTRAP variable being set, including empty.
 if [[ "${!KOLLA_BOOTSTRAP[@]}" ]]; then
     sudo chown nova: /var/lib/nova/
-    mkdir /var/lib/nova/instances
+    mkdir -p /var/lib/nova/instances
+    # Only update permissions if permissions need to be updated
+    if [[ $(stat -c %U:%G /var/lib/nova/instances) != "nova:nova" ]]; then
+        sudo chown nova: /var/lib/nova/instances
+    fi
     exit 0
 fi

docker/openstack-base/Dockerfile.j2

@@ -106,7 +106,7 @@ RUN apt-get install -y --no-install-recommends \
 
 ADD openstack-base-archive /openstack-base-source
 RUN ln -s openstack-base-source/* /requirements \
-    && mkdir /var/lib/kolla \
+    && mkdir -p /var/lib/kolla \
     && curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py \
     && python get-pip.py \
     && rm get-pip.py \

docker/swift/swift-base/Dockerfile.j2

@@ -34,4 +34,4 @@ RUN ln -s swift-base-source/* swift \
 {% endif %}
 
 COPY build-swift-ring.py /usr/local/bin/kolla_build_swift_ring
-RUN mkdir /opt/swift
+RUN mkdir -p /opt/swift