Introduce __version__ and __version_info__

Ported from stable/0.2 branch.

Change-Id: I090d96efb62ab72cac39a76a897d563199adbf36

ironic_discoverd/__init__.py

@@ -0,0 +1,15 @@
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+__version_info__ = (1, 0, 0)
+__version__ = '%d.%d.%d' % __version_info__

setup.py

@@ -8,9 +8,13 @@ with open('requirements.txt', 'r') as fp:
                         for line in fp if line.strip()]
 
 
+with open('ironic_discoverd/__init__.py', 'rb') as fp:
+    exec(fp.read())
+
+
 setup(
     name = "ironic-discoverd",
-    version = "1.0.0",
+    version = __version__,
     description = open('README.rst', 'r').readline().strip(),
     author = "Dmitry Tantsur",
     author_email = "dtantsur@redhat.com",