slapgrid: support intermediate software state

By just taking action "destroy" where requested state is destroyed and
installing for all other states, we can inform master of the state.
XXX this is wrong !

slapos/grid/slapgrid.py

@@ -534,6 +534,7 @@ stderr_logfile_backups=1
     clean_run = True
     for software_release in self.computer.getSoftwareReleaseList():
       state = software_release.getState()
+      action = 'destroy' if state == 'destroyed' else 'install'
       try:
         software_release_uri = software_release.getURI()
         url_hash = md5digest(software_release_uri)
@@ -567,7 +568,7 @@ stderr_logfile_backups=1
         for manager in self._manager_list:
           manager.software(software)
 
-        if state == 'available':
+        if action == 'install':
           completed_tag = os.path.join(software_path, '.completed')
           if (self.develop or (not os.path.exists(completed_tag) and
                  len(self.software_release_filter_list) == 0) or
@@ -580,7 +581,7 @@ stderr_logfile_backups=1
             software.install()
             with open(completed_tag, 'w') as fout:
               fout.write(time.asctime())
-        elif state == 'destroyed':
+        elif action == 'destroy':
           if os.path.exists(software_path):
             self.logger.info('Destroying %r...' % software_release_uri)
             software.destroy()
@@ -610,12 +611,12 @@ stderr_logfile_backups=1
         software_release.error(traceback.format_exc(), logger=self.logger)
         clean_run = False
       else:
-        if state == 'available':
+        if action == 'install':
           try:
             software_release.available()
           except (NotFoundError, ServerError):
             pass
-        elif state == 'destroyed':
+        elif action == 'destroy':
           try:
             software_release.destroyed()
           except (NotFoundError, ServerError):