Small fixes for running Nova services under Apache2

Following fixed were done:
1. Cleanup fixed.
2. API_WORKERS config option was added to nova config templates.
3. Nova API screen tabs were named as nova-api and nova-ec2-api.

Change-Id: I68dc6fd6c8aeffcec7f9039afd63bd1599c65682
diff --git a/files/apache-nova-api.template b/files/apache-nova-api.template
index 70ccedd..301a3bd 100644
--- a/files/apache-nova-api.template
+++ b/files/apache-nova-api.template
@@ -1,7 +1,7 @@
 Listen %PUBLICPORT%
 
 <VirtualHost *:%PUBLICPORT%>
-    WSGIDaemonProcess nova-api processes=5 threads=1 user=%USER% display-name=%{GROUP} %VIRTUALENV%
+    WSGIDaemonProcess nova-api processes=%APIWORKERS% threads=1 user=%USER% display-name=%{GROUP} %VIRTUALENV%
     WSGIProcessGroup nova-api
     WSGIScriptAlias / %PUBLICWSGI%
     WSGIApplicationGroup %{GLOBAL}
@@ -13,4 +13,4 @@
     %SSLENGINE%
     %SSLCERTFILE%
     %SSLKEYFILE%
-</VirtualHost>
\ No newline at end of file
+</VirtualHost>