virttest/utils_netperf: fix spelling errors (avocado-framework#4207)

4ce1c76 included bad spelling.

Fix it.

Signed-off-by: Sebastian Mitterle <smitterl@redhat.com>

Author: smitterl

spell.ignore

@@ -1164,6 +1164,7 @@ guestmount
 gz
 handlings
 hardcode
+hardcoded
 Hardcode
 harddrives
 Hariharan

virttest/utils_netperf.py

@@ -190,7 +190,7 @@ def _mod_max_cpus(self):
         Modify the value from the source code previous to compilation to the
         desired value.
         """
-        # Obtain host/guest/vm/target netperf running sytem's number of CPUs
+        # Obtain host/guest/vm/target netperf running system's number of CPUs
         try:
             n_cpus = int(
                 self.session.cmd_output('lscpu | grep -oP "^CPU\(s\)\: *\K[0-9]+"')