Fix representation of signal.SIG* constants

Pass signals as strings instead of using python constants
which depend on host system and have different types on py27 vs py3.

Change-Id: Ib8d7136bb3aed125a987678672142ce72e33af6f
Closes-bug: #1836736

os_faults/ansible/modules/freeze.py

@@ -30,8 +30,8 @@ def main():
            'echo -en \'/bin/bash\\npids=`ps ax | '
            'grep -v grep | '
            'grep %s | awk {{\\047print $1\\047}}`; '
-           'echo $pids | xargs kill -19; sleep %s; '
+           'echo $pids | xargs kill -SIGSTOP; sleep %s; '
-           'echo $pids | xargs kill -18; rm \' >> $tf; '
+           'echo $pids | xargs kill -SIGCONT; rm \' >> $tf; '
            'echo -n $tf >> $tf; '
            'chmod 770 $tf; nohup $tf &"') % (grep, sec)
     rc, stdout, stderr = module.run_command(cmd, check_rc=True)

os_faults/ansible/modules/kill.py

@@ -19,7 +19,7 @@ def main():
     module = AnsibleModule(
         argument_spec=dict(
             grep=dict(required=True, type='str'),
-            sig=dict(required=True, type='int')
+            sig=dict(required=True, type='str')
         ))
 
     grep = module.params['grep']

os_faults/drivers/services/process.py

@@ -12,7 +12,6 @@
 # limitations under the License.
 
 import logging
-import signal
 
 from os_faults.ansible import executor
 from os_faults.api import error
@@ -121,7 +120,7 @@ class ServiceAsProcess(service.Service):
     def kill(self, nodes=None):
         task = {
             'kill': {
-                'grep': self.grep, 'sig': signal.SIGKILL
+                'grep': self.grep, 'sig': 'SIGKILL'
             },
             'become': 'yes',
         }
@@ -138,7 +137,7 @@ class ServiceAsProcess(service.Service):
         else:
             task = {
                 'kill': {
-                    'grep': self.grep, 'sig': signal.SIGSTOP
+                    'grep': self.grep, 'sig': 'SIGSTOP'
                 },
                 'become': 'yes',
             }
@@ -148,7 +147,7 @@ class ServiceAsProcess(service.Service):
     def unfreeze(self, nodes=None):
         task = {
             'kill': {
-                'grep': self.grep, 'sig': signal.SIGCONT
+                'grep': self.grep, 'sig': 'SIGCONT'
             },
             'become': 'yes',
         }