Support local config file in WorkloadManagementScheduler

Feature Request
In WorkloadManagementScheduler/wlm_scheduler.py
Currently both inplace configuration and json files stored in s3 are supported.
Additionally add support for local json file stored in lambda's code dir.

amazon-redshift-utils/src/WorkloadManagementScheduler/wlm_scheduler.py

Lines 98 to 105 in 7d2361b

    
           if CONFIG_KEY in ruleset and isinstance(ruleset[CONFIG_KEY], list): 
        
               wlm_config = json.dumps(ruleset[CONFIG_KEY]) 
        
           elif CONFIG_KEY in ruleset and isinstance(ruleset[CONFIG_KEY], basestring): 
        
               if ruleset[CONFIG_KEY].startswith('s3://'): 
        
                   wlm_config = json.dumps(get_file_contents(ruleset[CONFIG_KEY], region_name)) 
        
           else: 
        
               raise Exception( 
        
                   "Malformed Configuration for Ruleset %s. '%s' must be a json based WLM configuration or an S3 file location" % (

	if CONFIG_KEY in ruleset and isinstance(ruleset[CONFIG_KEY], list):
	wlm_config = json.dumps(ruleset[CONFIG_KEY])
	elif CONFIG_KEY in ruleset and isinstance(ruleset[CONFIG_KEY], basestring):
	if ruleset[CONFIG_KEY].startswith('s3://'):
	wlm_config = json.dumps(get_file_contents(ruleset[CONFIG_KEY], region_name))
	else:
	raise Exception(
	"Malformed Configuration for Ruleset %s. '%s' must be a json based WLM configuration or an S3 file location" % (