Retrieve pip path after creating virtualenv

Retrieve the pip path after creating a non-existent virtualenv.
Prevents the problem of using the wrong pip if virtualenv doesn't
exist yet.

library/pip

@@ -101,7 +101,6 @@ def main():
     out = ''
 
     env = module.params['virtualenv']
-    pip = _find_pip(module, env)
 
     if env:
         virtualenv = _find_virtualenv(module)
@@ -112,6 +111,8 @@ def main():
         out += out_venv
         err += err_venv
 
+    pip = _find_pip(module, env)
+
     state = module.params['state']
     name = module.params['name']
     version = module.params['version']