fsm: add LOGPFSML to pass explicit logging level

Provide one central LOGPFSML to print FSM information, take the FSM logging
subsystem from the FSM instance but use an explicitly provided log level
instead of the FSM's default level.

Use to replace some, essentially, duplications of the LOGPFSM macro.

In effect, the fsm_test's expected error changes, since the previous code dup
for logging events used round braces to indicate the fi's state, while the
central macro uses curly braces.

Change-Id: If295fdabb3f31a0fd9490d1e0df57794c75ae547
diff --git a/tests/fsm/fsm_test.err b/tests/fsm/fsm_test.err
index b9c738c..c9021bb 100644
--- a/tests/fsm/fsm_test.err
+++ b/tests/fsm/fsm_test.err
@@ -1,7 +1,7 @@
 Checking FSM allocation
 Test FSM{NULL}: Allocated
 Test FSM{NULL}: Received Event 1
-Test FSM(NULL): Event 1 not permitted
+Test FSM{NULL}: Event 1 not permitted
 Test FSM{NULL}: Received Event 0
 Test FSM{NULL}: state_chg to ONE
 Test FSM{ONE}: Received Event 1