chassis_control: remove execute permissions

Change-Id: I6ba0bfe7463cf8647d07218174d578f2c96e076a
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/pychassisctl/chassis_control.py b/pychassisctl/chassis_control.py
old mode 100755
new mode 100644