Have timers be a trigger type in microseconds

Extract and generate timers in microseconds for all event triggers and
actions that take a timer as a parameter.

Tested:
    Timers are created on events with timer triggers defined
    Inspect that generated timers are created in microseconds
    No timer is created for events without a timer trigger

Change-Id: I345f247782779ef142fe0d569632be2b6c11f0c3
Signed-off-by: Matthew Barth <msbarth@us.ibm.com>
diff --git a/control/templates/defs.mako b/control/templates/defs.mako
index 30045f6d..fd8d97d 100644
--- a/control/templates/defs.mako
+++ b/control/templates/defs.mako
@@ -59,8 +59,11 @@
 %endfor
 },
 TimerConf{
-    ${event['timer']['interval']},
-    ${event['timer']['type']}
+    %if ('timer' in event['triggers']) and \
+        (event['triggers']['timer'] is not None):
+    ${event['triggers']['timer']['interval']},
+    ${event['triggers']['timer']['type']}
+    %endif
 },
 std::vector<Signal>{
 %for s in event['triggers']['signals']: