ftests/077: drop unused global and fix list sorting

flake8 reported:
tests/ftests/077-pybindings-cgroup_get_procs.py:52:5: F824  is unused:
	name is never assigned in scope

The test already appends to the module-level list, so we do not reassign
it inside setup(). Drop the unused global declaration and call
list.sort() without reassigning the result to keep the pid lists in order
before comparing them.

Signed-off-by: Kamalesh Babulal <kamalesh.babulal@oracle.com>

Author: kamalesh-babulal

tests/ftests/077-pybindings-cgroup_get_procs.py

@@ -36,7 +36,6 @@ def prereqs(config):
 
 
 def setup(config):
-    global initial_pid_list
     CgroupCli.create(config, CONTROLLERS, CGNAME)
     CgroupCli.create(config, CONTROLLERS, EMPTY_CGNAME)
 
@@ -45,11 +44,10 @@ def setup(config):
         initial_pid_list.append(pid)
 
     CgroupCli.classify(config, CONTROLLERS, CGNAME, initial_pid_list, ignore_systemd=True)
-    initial_pid_list = initial_pid_list.sort()
+    initial_pid_list.sort()
 
 
 def test(config):
-    global initial_pid_list
     result = consts.TEST_PASSED
     cause = None