Remove unused imports (#70)

Author: jleveque

sonic-ledd/scripts/ledd

@@ -7,12 +7,7 @@
 
 try:
     import getopt
-    import os
-    import imp
-    import signal
-    import subprocess
     import sys
-    import syslog
     from swsscommon import swsscommon
     from sonic_daemon_base import daemon_base
     from sonic_daemon_base.daemon_base import Logger

sonic-psud/scripts/psud

@@ -11,7 +11,6 @@
 
 try:
     import sys
-    import time
     import signal
     import threading
     from swsscommon import swsscommon

sonic-thermalctld/scripts/thermalctld

@@ -6,8 +6,6 @@
 """
 
 try:
-    import os
-    import sys
     import time
     import signal
     import threading