Update junctions.py

[djorgen-ibm]

removed the replacement of '_' with '-' for remote_http_header from the existing junction.

[tombosmansibm]

I think this is necessary because of a difference between input and output parameters (output is iv_user, input is iv-user).
See https://ibm-security.github.io/apidocs/verifyaccess/10.0.7.0/ISVA-mgmt-rest-api/index.html

[tombosmansibm]

So the fix is the expansion of all -> list needs to have the '-' syntax.

                if remote_http_header is None or remote_http_header == []:
                    jct_json['remote_http_header'] = 'do not insert'
                elif isinstance(remote_http_header, basestring) and remote_http_header.lower() == 'all':
                    jct_json['remote_http_header'] = ['iv-creds', 'iv-groups', 'iv-user']

[tombosmansibm]

I've rewritten the compare functions for the junctions.py and junctions_server.py -> #411

"all" (as string or as array) is now handled differently -> it's sent to the API now (instead of translating it first).