[Enhancement] Added --version flag

Change-Id: I4f90673ce4855ada405c4e93c9f4c2c08707e6fe
Fix: bz#1011691

bin/release.sh

@@ -11,6 +11,7 @@ if [ "$1" = "release" ] ; then
     SNAPTAG=""
 else
     SNAPTAG=$(git log --oneline | wc -l)
+    sed -i -e "s/SNAPTAG=None/SNAPTAG=${SNAPTAG}/g" packstack/version.py
 fi
 
 python setup.py setopt -o tag_build -s "$SNAPTAG" -c egg_info

packstack/installer/run_setup.py

@@ -20,6 +20,7 @@ import processors
 import output_messages
 from .exceptions import FlagValidationError, ParamValidationError
 
+from packstack import version
 from packstack.modules.ospluginutils import gethostlist
 from setup_controller import Controller
 
@@ -702,7 +703,7 @@ def initCmdLineParser():
 
     # Init parser and all general flags
     usage = "usage: %prog [options] [--help]"
-    parser = OptionParser(usage)
+    parser = OptionParser(usage=usage,version="%prog {0} {1}".format(version.release_string(), version.version_string()))
     parser.add_option("--gen-answer-file", help="Generate a template of an answer file, using this option excludes all other options")
     parser.add_option("--answer-file", help="Runs the configuration in non-interactive mode, extracting all information from the \
                                             configuration file. using this option excludes all other options")

packstack/version.py

@@ -1,11 +1,14 @@
 
-VERSION = ['2013', '2', '1']
+VERSION = ['2014', '1', '1']
 FINAL=False
+RELEASE="Icehouse"
+SNAPTAG=None
+
+def release_string():
+    return RELEASE
 
 def version_string():
     if FINAL:
         return '.'.join(filter(None, VERSION))
     else:
-        return '.'.join(filter(None, VERSION))+"dev"
-        
-
+        return '.'.join(filter(None, VERSION))+"dev{0}".format(SNAPTAG)