Global name 'config' not defined for getting azure job store
`global name 'config' is not defined` error found in `toil/common.py` on line 617 in `getJobStore` when running toil version 3.3.1 on an Azure cluster. Error does not show up for toil version 3.2.1 and the toil script runs to completion. File `.toilAzureCredentials` is set properly.

Toil script command:
`./vg_evaluation_pipeline.py --batchSystem mesos --mesosMaster 10.0.0.5:5050 --realTimeLogging --logError --logDebug --edge_max 5 --kmer_size 16 --index_mode gcsa-mem --include_primary 'azure:hgvm:hgvmeval-jobstore33' --path_name 'ref' --path_size 81189 '/home/cmarkello/debug_eval_input/BRCA1.vg' '/home/cmarkello/debug_eval_input/BRCA1/NA12877/NA12877.bam.fq' 'NA12877' '/home/cmarkello/debug_eval_output' 'azure:hgvm:hgvmdebugtest-input' 'azure:hgvm:hgvmdebugtest-output'`

Toil script `main(args)` function:
`

```
if len(args) == 2 and args[1] == "--test":
    # Run the tests
    return doctest.testmod(optionflags=doctest.NORMALIZE_WHITESPACE)

RealTimeLogger.start_master()
options = parse_args(args) # This holds the nicely-parsed options object

with Toil(options) as toil:
    if not toil.options.restart:

        # Upload local files to the remote IO Store
        inputGraphFileID = toil.importFile('file://'+options.vg_graph)
        inputReadsFileID = toil.importFile('file://'+options.sample_reads)
        uploadList = [[inputGraphFileID, options.vg_graph], [inputReadsFileID, options.sample_reads]]

        # Make a root job
        root_job = Job.wrapJobFn(run_upload, options, uploadList, cores=2, memory="5G", disk="5G")

        # Run the job and store the returned list of output files to download
        outputFileIDList = toil.start(root_job)
    else:
        outputFileIDList = toil.restart()

    # Download output files to the local machine that runs this script
    run_download(toil, options, outputFileIDList)

print("All jobs completed successfully")

RealTimeLogger.stop_master()`
```

diff --git a/src/toil/common.py b/src/toil/common.py
index 911e86e3..caf6a4b3 100644
--- a/src/toil/common.py
+++ b/src/toil/common.py
@@ -633,7 +633,7 @@ class Toil(object):
         elif name == 'azure':
             from toil.jobStores.azureJobStore import AzureJobStore
             account, namePrefix = rest.split(':', 1)
-            return AzureJobStore(account, namePrefix, config=config)
+            return AzureJobStore(rest)
 
         elif name == 'google':
             from toil.jobStores.googleJobStore import GoogleJobStore
['src/toil/common.py']