add new API to delete high number of devices

[AlvaroVega]

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[AlvaroVega]

Current delete is for one device:

i.e.:
DELETE
https://localhost/iota/iot/devices/DeviceID?apikey=gu1y31lo1agyr2xqf448n0s5v&protocol=IoTA-JSON

imnplemented by:

iotagent-node-lib/lib/services/northBound/deviceProvisioningServer.js

Lines 417 to 421 in 301280a

	router.delete(
	'/iot/devices/:deviceId',
	restUtils.checkRequestAttributes('headers', mandatoryHeaders),
	handleRemoveDevice
	);

[AlvaroVega]

@fgalan

[fgalan]

Fixed by PR #1579