Migrate the dynamic creds module to tempest lib
This commit migrates the dynamic credentials provider from
tempest/common into tempest/lib.
Change-Id: Id8d60e4d7c22bc72c3e48bc768509ff0cc0c89d5
diff --git a/doc/source/library/credential_providers.rst b/doc/source/library/credential_providers.rst
new file mode 100644
index 0000000..fea20bf
--- /dev/null
+++ b/doc/source/library/credential_providers.rst
@@ -0,0 +1,16 @@
+.. _cred_providers:
+
+Credential Providers
+====================
+
+These library interfaces are used to deal with allocating credentials on demand
+either dynamically by calling keystone to allocate new credentials, or from
+a list of preprovisioned credentials.
+
+
+------------------------------
+The dynamic credentials module
+------------------------------
+
+.. automodule:: tempest.lib.common.dynamic_creds
+ :members: