rename stacktask cmd to stacktask-api

* Done so that the client tool and the server
  can both be installed to the same environment.

Change-Id: Ic188c87600730b51b3dbf97b244b979d205e7eb9

setup.py

@@ -36,7 +36,7 @@ setup(
     install_requires=required,
     entry_points={
         'console_scripts': [
-            'stacktask = stacktask:management_command',
+            'stacktask-api = stacktask:management_command',
         ],
     }
 )

tox.ini

@@ -6,5 +6,5 @@ skipsdist = True
 usedevelop = True
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
-commands = stacktask test stacktask
+commands = stacktask-api test stacktask
 setenv = VIRTUAL_ENV={envdir}