ipaclient: Use paths variables for executables used in modules

paths.KDESTROY instead of "kdestroy" and paths.GETENT instead of "getent"

Affected modules:
  roles/ipaclient/library/ipahost.py
  roles/ipaclient/library/ipajoin.py
  roles/ipaclient/library/ipanss.py

roles/ipaclient/library/ipahost.py

@@ -353,7 +353,7 @@ def main():
     except Exception as e:
         module.fail_json(msg="ipahost module failed : %s" % str(e))
     finally:
-        run(["kdestroy"], raiseonerr=False, env=os.environ)
+        run([paths.KDESTROY], raiseonerr=False, env=os.environ)
 
     module.exit_json(changed=changed, host=host)
 

roles/ipaclient/library/ipajoin.py

@@ -263,7 +263,7 @@ def main():
                 module.log("Host is already joined")
             else:
                 if principal:
-                    run(["kdestroy"], raiseonerr=False, env=env)
+                    run([paths.KDESTROY], raiseonerr=False, env=env)
                 module.fail_json(msg="Joining realm failed: %s" % stderr)
         else:
             changed = True
@@ -274,7 +274,7 @@ def main():
             module.fail_json(msg="krb5.keytab missing! Retry with ipaclient_force_join=yes to generate a new one.")
 
         if principal:
-            run(["kdestroy"], raiseonerr=False, env=env)
+            run([paths.KDESTROY], raiseonerr=False, env=env)
 
         # Obtain the TGT. We do it with the temporary krb5.conf, sot
         # tha only the KDC we're installing under is contacted.

roles/ipaclient/library/ipanss.py

@@ -288,7 +288,7 @@ def main():
         # Particulary, SSSD might take longer than 6-8 seconds.
         while n < 10 and not found:
             try:
-                ipautil.run(["getent", "passwd", user])
+                ipautil.run([paths.GETENT if hasattr(paths, "KDESTROY") else "getent", "passwd", user])
                 found = True
             except Exception as e:
                 time.sleep(1)