util: fix the functions "create_netns" and "setcap_netsys_admin".

This commit fixes 2 functions from util.py:
 - setcap_netsys_admin: removed "self" from the arguments.
 - create_netns: pass "run_dir" to Process and convert the arguments to
a list as the other methods in the file.

Change-Id: Ida4c6d6500be92b8d1f96e4e7a870e63bd329be9
diff --git a/src/osmo_gsm_tester/core/util.py b/src/osmo_gsm_tester/core/util.py
index 691b489..5ca6ad9 100644
--- a/src/osmo_gsm_tester/core/util.py
+++ b/src/osmo_gsm_tester/core/util.py
@@ -102,7 +102,7 @@
     proc = Process(SETCAP_NET_ADMIN_BIN, run_dir, ['sudo', SETCAP_NET_ADMIN_BIN, binary])
     proc.launch_sync()
 
-def setcap_netsys_admin(self, binary, run_dir):
+def setcap_netsys_admin(binary, run_dir):
     '''
     This functionality requires specific setup on the host running
     osmo-gsm-tester. See osmo-gsm-tester manual for more information.
@@ -118,7 +118,7 @@
     '''
     from .process import Process
     NETNS_SETUP_BIN = 'osmo-gsm-tester_netns_setup.sh'
-    proc = Process('create_netns', ('sudo', NETNS_SETUP_BIN, netns))
+    proc = Process('create_netns',run_dir, ['sudo', NETNS_SETUP_BIN, netns])
     proc.launch_sync()
 
 def move_iface_to_netns(ifname, netns, run_dir):