[equo] text_ui: when calling execv*, use "equo" as application name (this will work in any case)

When debugging entropy client it's common to use "python equo.py",
but this doesn't work well with equo upgrade autorespawn code that
is using execvp()

client/text_ui.py

@@ -531,7 +531,7 @@ def upgrade_packages(entropy_client, onlyfetch = False, replay = False,
         # Entropy Client SystemSettings plugin
         entropy_client.Settings().clear()
 
-    if update:
+    if update and not etpUi['pretend']:
         # if updates have been installed, check if there are more
         # to come (perhaps critical updates were installed)
         _upgrade_packages_respawn(entropy_client)
@@ -549,7 +549,7 @@ def _upgrade_packages_respawn(entropy_client):
             _("There are more updates to install, reloading Entropy"),) ))
         # then spawn a new process
         entropy_client.shutdown()
-        os.execvp(sys.argv[0], sys.argv)
+        os.execvp("equo", sys.argv)
 
 def branch_hop(entropy_client, branch):