Update docs with stable/pike repos

The install documentation is currently missing the pike repository
information. This change adds stable/pike into the repository
documentation.

Change-Id: Ia34da03343d726d4796013a816bd5ed53e9d3edf
Closes-Bug: #1723265

_custom/custom.css

@@ -64,6 +64,7 @@
 .stable {background: #eed;}
 .newton {background: #ede;}
 .ocata {background: #edd;}
+.pike {background: #dfb;}
 .centos {background: #fef;}
 .baremetal {background: #eef;}
 .virtual {background: #efe;}

doc/source/index.rst

@@ -83,6 +83,11 @@ Linux (RHEL). These steps are marked as follows:
 
    Step that should only be run when installing from the Ocata stable branch.
 
+.. admonition:: Pike
+   :class: pike
+
+   Step that should only be run when installing from the Pike stable branch.
+
 .. admonition:: Validations
    :class: validations
 

doc/source/install/repositories.txt

@@ -54,6 +54,31 @@
            sudo yum -y install --enablerepo=extras centos-release-ceph-jewel
            sudo sed -i -e 's%gpgcheck=.*%gpgcheck=0%' /etc/yum.repos.d/CentOS-Ceph-Jewel.repo
 
+  .. admonition:: Pike
+     :class: pike otop
+
+     Enable latest RDO Pike Delorean repository for all packages
+
+     ::
+
+        sudo curl -L -o /etc/yum.repos.d/delorean-pike.repo https://trunk.rdoproject.org/centos7-pike/current/delorean.repo
+
+     Enable the Pike Delorean Deps repository
+
+     ::
+
+        sudo curl -L -o /etc/yum.repos.d/delorean-deps-pike.repo https://trunk.rdoproject.org/centos7-pike/delorean-deps.repo
+
+     .. admonition:: Ceph
+        :class: ceph
+
+        Enable the CentOS Storage SIG Ceph/Jewel repository if using Ceph
+
+        ::
+
+           sudo yum -y install --enablerepo=extras centos-release-ceph-jewel
+           sudo sed -i -e 's%gpgcheck=.*%gpgcheck=0%' /etc/yum.repos.d/CentOS-Ceph-Jewel.repo
+
 
 Enable last known good RDO Trunk Delorean repository for core openstack packages