add config provider and examples for images api

- edit reference.*.config to conform to configparser properties
- edit reference.xml.config to reflect xml as marshalling method

Change-Id: I6a6392dfc306de0b57adc8006df11f3b1ce983d5

configs/images/reference.json.config

@@ -0,0 +1,24 @@
+# ======================================================
+# reference.json.config
+# ------------------------------------------------------
+# This configuration is specifically a reference
+# implementation for a configuration file.
+# You must create a proper configuration file and supply
+# the correct values for your Environment(s)
+#
+# For multiple environments it is suggested that you
+# generate specific configurations and name the files
+# along the lines of
+# <ENVIRONMENT>.<FORMAT>.config
+# ======================================================
+
+[marshalling]
+serialize_format=json
+deserialize_format=json
+
+[images]
+base_url=<base_url>
+api_version=<v1/v2>
+primary_image=<image_id>
+secondary_image=<different_image_id>
+

configs/images/reference.xml.config

@@ -0,0 +1,24 @@
+# ======================================================
+# reference.json.config
+# ------------------------------------------------------
+# This configuration is specifically a reference
+# implementation for a configuration file.
+# You must create a proper configuration file and supply
+# the correct values for your Environment(s)
+#
+# For multiple environments it is suggested that you
+# generate specific configurations and name the files
+# along the lines of
+# <ENVIRONMENT>.<FORMAT>.config
+# ======================================================
+
+[marshalling]
+serialize_format=xml
+deserialize_format=xml
+
+[images]
+base_url=<base_url>
+api_version=<v1/v2>
+primary_image=<image_id>
+secondary_image=<different_image_id>
+