fix conditional with mkdir -p

There was an error in the conditional due to spacing (no space after the quotes). To fix
it I decided to replace the conditional with simpler 'mkdir -p' command.

Change-Id: I0f83e2823c69c5f9e3427e0925335e54e9b6c2a0

modules/openstack_project/files/jenkins_job_builder/config/gerrit.yaml

@@ -104,10 +104,7 @@
     builders:
       - shell: |
           #!/bin/bash -xe
-          if [[ ! -d "gerrit"]]
-          then
-            mkdir gerrit
-          fi
+          mkdir -p gerrit
           cd gerrit
           /usr/local/jenkins/slave_scripts/gerrit-git-prep.sh https://review.openstack.org http://zuul.openstack.org git://git.openstack.org
       - shell: |
@@ -146,10 +143,7 @@
     builders:
       - shell: |
           #!/bin/bash -xe
-          if [[ ! -d "gerrit"]]
-          then
-            mkdir gerrit
-          fi
+          mkdir -p gerrit
           cd gerrit
           /usr/local/jenkins/slave_scripts/gerrit-git-prep.sh https://review.openstack.org http://zuul.openstack.org git://git.openstack.org
       - shell: |
@@ -184,10 +178,7 @@
     builders:
       - shell: |
           #!/bin/bash -xe
-          if [[ ! -d "gerrit"]]
-          then
-            mkdir gerrit
-          fi
+          mkdir -p gerrit
           cd gerrit
           /usr/local/jenkins/slave_scripts/gerrit-git-prep.sh https://review.openstack.org http://zuul.openstack.org git://git.openstack.org
       - shell: |