Publish API/CLI/SDK site to developer.o.o

The Docs Team has determined that a developer.openstack.org URL is
more discoverable than api.openstack.org for API, CLI and SDK
content. A new site and Jenkins publish target have been created for
this.

Change-Id: I2a3fcc8ccf0622334a78c27252a94f38d270e4f7

modules/openstack_project/files/jenkins_job_builder/config/api-jobs.yaml

@@ -44,7 +44,7 @@
       - console-log
       - upload-doc-build-results
       - ftp:
-          site: api.openstack.org
+          site: developer.openstack.org
           source: 'publish-docs/api-ref/**'
           target: '/'
           remove-prefix: 'publish-docs/api-ref/'
@@ -62,7 +62,7 @@
 
     publishers:
       - ftp:
-          site: api.openstack.org
+          site: developer.openstack.org
           source: 'www/**'
           target: ''
           remove-prefix: 'www/'