Use RDO Pike repository

Update docs and bootstrap vars to use the RDO Pike repository.

Related-Bug: 1715239
Change-Id: I21ab8e13f25bb7a769dcf504fa6915303bc2feec

deploy-guide/source/deploymenthost.rst

@@ -80,7 +80,7 @@ Before you begin, we recommend upgrading your system packages and kernel.
 
    .. code-block:: shell-session
 
-       # yum install https://rdoproject.org/repos/openstack-ocata/rdo-release-ocata.rpm
+       # yum install https://rdoproject.org/repos/openstack-pike/rdo-release-pike.rpm
        # yum install git ntp ntpdate openssh-server python-devel \
          sudo '@Development Tools'
 

doc/source/contributor/quickstart-aio.rst

@@ -61,7 +61,7 @@ system packages are upgraded and then reboot into the new kernel:
 
    ## CentOS
    # yum upgrade
-   # yum install https://rdoproject.org/repos/openstack-ocata/rdo-release-ocata.rpm
+   # yum install https://rdoproject.org/repos/openstack-pike/rdo-release-pike.rpm
    # yum install git
    # reboot
 

tests/roles/bootstrap-host/vars/redhat.yml

@@ -13,7 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-rdo_package: "https://rdoproject.org/repos/openstack-ocata/rdo-release-ocata.rpm"
+rdo_package: "https://rdoproject.org/repos/openstack-pike/rdo-release-pike.rpm"
 
 packages_install:
   - bridge-utils