Base part of a server REST API

The patch introduces a first version of REST API. Rally can be run
as-a-Service by the shell script rally-api. By default a service binds
to a socket 0.0.0.0:8877. The pair of binding parameters have got own
section called an 'api'. One of the supported Content-Type is an
'application/json'.

TODO:
* A Deployment and a Task controllers/types.
* Proper exception handling.

blueprint rally-service-api-v1

Change-Id: Ib0a1f141a083a35c8d43aed2bb1db3307e022b70

etc/rally/rally.conf.sample

@@ -122,6 +122,19 @@
 # Path to CA server cetrificate for SSL (string value)
 #https_cacert=
 
+[api]
+
+#
+# Options defined in rally.api
+#
+
+# The port for the Rally API server (integer value)
+#port=8877
+
+# The listen IP for the Rally API server (string value)
+#host=0.0.0.0
+
+
 [database]
 
 #

requirements.txt

@@ -7,7 +7,7 @@ netaddr>=0.7.6
 oslo.config>=1.2.0
 paramiko>=1.9.0
 pbr>=0.6,<1.0
-Mako>=0.4.0
+pecan>=0.4.5
 PrettyTable>=0.7,<0.8
 PyYAML>=3.1.0
 python-glanceclient>=0.9.0
@@ -20,3 +20,4 @@ python-ceilometerclient>=1.0.6
 requests>=1.1
 SQLAlchemy>=0.7.8,<=0.8.99
 six>=1.5.2
+WSME>=0.6

setup.cfg

@@ -24,11 +24,11 @@ packages =
 [entry_points]
 console_scripts =
     rally = rally.cmd.main:main
+    rally-api = rally.cmd.api:main
     rally-manage = rally.cmd.manage:main
     openstack-rally = rally.cmd.main:deprecated
     openstack-rally-manage = rally.cmd.manage:deprecated
 
-
 [global]
 setup-hooks =
     pbr.hooks.setup_hook