id/type patterns for batch update operation

[fgalan]

For POST /v2/op/update (and for the batch operations described at #2388, in the case that issue gets considered at the end) allow entity patterns. Currently the entities vector only allows single ids and types, but idPattern and typePattern could be also considered.

The implications of this operation has to be taken into account, e.g. multi-entity update could be considered dangerous (specially in the case of deletion) and this possibility not considered at the end.

[fgalan]

This issue is related with:

• Same issue (but mentioning isPattern in NGSIv1) isPattern true support in updateContext #1503
• Particular case for delete: [Improvement][V1] Delete all entities for a given type #1645

Probablty the 3 issues should be addressed at once.

[fgalan]

The answer to this SOF question should be edited once this issue gets completed: http://stackoverflow.com/questions/39732799/orion-context-broker-delete-several-entities-at-one-call

[fgalan]

With regards to deletion, the following script can be useful to delete all entities (of a given type and/or matching a given filter) while this issue gets implemented: https://github.com/telefonicaid/fiware-orion/blob/master/scripts/utils/delete_entities.py

[fgalan]

Currently the entities vector only allows single ids and types, but idPattern and typePattern could be also considered.

In particular, NGSIv2 specs says:

entities, an array of entities, each entity specified using the JSON entity representation format (described in the section "JSON Entity Representation").

and "JSON Entity Representation" is based in id/type.

[fgalan]

Out of the scope of NGSIv2, althouth it is a good idea that could (potentially) be included in a later version of the API (v2.1) in a backward compatible way.

CC: @jmcanterafonseca