Remove "#!/usr/bin/env python" from .py files under nova/cmd

Fix bug 1178543

Now in Havana, all nova service script start up logic are moved to
nova/cmd and those files are not simply python script but python
files, so there is no need to still keep "#!/usr/bin/env python"
for those files since they won't be run directly as scripts.

Change-Id: Ic102215dc0200ec1f6b47951bef31d58b08022ef

nova/cmd/spicehtml5proxy.py

@@ -1,4 +1,3 @@
-#!/usr/bin/env python
 # vim: tabstop=4 shiftwidth=4 softtabstop=4
 
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