pf9ctl support upgrade fails with stack trace

[pshanbhag]

pf9ctl support upgrade

{'url_zip': u'https://api.github.com/repos/platform9/express/zipball/v1.3.6', 'version': u'v1.3.6', 'url_tar': u'https://api.github.com/repos/platform9/express/tarball/v1.3.6'}
Traceback (most recent call last):
File "/bin/pf9ctl", line 8, in
sys.exit(cli())
File "/root/pf9/pf9-venv/lib/python2.7/site-packages/click/core.py", line 829, in call
return self.main(*args, **kwargs)
File "/root/pf9/pf9-venv/lib/python2.7/site-packages/click/core.py", line 782, in main
rv = self.invoke(ctx)
File "/root/pf9/pf9-venv/lib/python2.7/site-packages/click/core.py", line 1259, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File "/root/pf9/pf9-venv/lib/python2.7/site-packages/click/core.py", line 1259, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File "/root/pf9/pf9-venv/lib/python2.7/site-packages/click/core.py", line 1066, in invoke
return ctx.invoke(self.callback, **ctx.params)
File "/root/pf9/pf9-venv/lib/python2.7/site-packages/click/core.py", line 610, in invoke
return callback(*args, **kwargs)
File "/root/pf9/pf9-venv/lib/python2.7/site-packages/click/decorators.py", line 33, in new_func
return f(get_current_context().obj, *args, **kwargs)
File "/root/pf9/pf9-venv/lib/python2.7/site-packages/pf9/support/commands.py", line 156, in upgrade
with open(pf9_exp_dir + 'version', 'r') as v:
IOError: [Errno 2] No such file or directory: '/root/pf9/pf9-venv/lib/python2.7/site-packages/pf9/express/version'