Move non-api guide out from API guide

The API guide should include information related to REST API interface.

Change-Id: I54632ee12914794fd18db82f9edd0d4b45401533

api-guide/source/index.rst

@@ -9,8 +9,6 @@ Contents
    secret_metadata
    containers
    acls
-   pkcs11keygeneration
-   dogtag_setup
    quotas
    consumers
    orders

doc/source/admin/index.rst

@@ -9,7 +9,8 @@ management of secrets.
 .. toctree::
    :maxdepth: 1
 
-   access_control.rst
+   access_control
-   barbican_manage.rst
+   barbican_manage
-   database_cleaning.rst
+   database_cleaning
-   upgrade.rst
+   upgrade
+   pkcs11keygeneration

doc/source/configuration/index.rst

@@ -4,10 +4,11 @@ Setting up Barbican
 .. toctree::
    :maxdepth: 1
 
-   keystone.rst
+   keystone
-   troubleshooting.rst
+   troubleshooting
-   noauth.rst
+   noauth
-   audit.rst
+   audit
-   plugin_backends.rst
+   plugin_backends
-   config.rst
+   config
-   policy.rst
+   policy
+   dogtag_setup