Update readme to add timeFactor in conf

WaveRider may take extra time for migration.  So we should normally
include time factor in the configuration file.

Also add more log for job status updates.

README.md

@@ -123,7 +123,8 @@ Available `float` config options:
 * `vmPolicy`: the VM creation policy, specified as a map.  Refer to the CLI usage
               for the list of available options.
 * `timeFactor`: a float number.  default to 1.  An extra factor to multiply based 
-  on the time supplied by the task.  Use it to resolve some task timeouts.
+  on the time supplied by the task.  Add time factor to enlarge the default timeout of the task.  
+  Because WaveRider may take extra time for job migration.
 * `maxCpuFactor`: a float number.  default to 4.  The maximum CPU cores of the instance is set
   to `maxCpuFactor` * `cpus` of the task.
 * `maxMemoryFactor`: a float number.  default to 4.  The maximum memory of the instance is set
@@ -187,6 +188,7 @@ float {
     address = 'op.center.address'
     username = secrets.MMC_USERNAME
     password = secrets.MMC_PASSWORD
+    timeFactor = 2
 }
 
 aws {

plugins/nf-float/src/main/com/memverge/nextflow/FloatTaskHandler.groovy

@@ -72,12 +72,15 @@ class FloatTaskHandler extends GridTaskHandler {
     @Override
     boolean checkIfCompleted() {
         final FloatStatus st =  floatExecutor.getJobStatus(task)
+        log.debug "got status ${st} for ${task.id} from float executor"
         if (st.finished) {
             status = COMPLETED
             task.exitStatus = readExitStatus()
             if (task.exitStatus == null) {
+                log.debug "can't get ${task.id} exit status from file system"
                 task.exitStatus = floatExecutor.getJobRC(task.id)
             }
+            log.debug "set ${task.id} exit status to ${task.exitStatus}"
             if (task.exitStatus == null) {
                 if (st.isError()) {
                     task.exitStatus = 1