Policies to cater for public access

[c0c0n3]

Is your feature request related to a problem? Please describe. TODO @c0c0n3 , @Cerfoglg flesh out

• public access: rego should cater for it, since some of the fields lua extracts may not be present---e.g. token
• tests for this feature would cover #199

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[c0c0n3]

Also notice a sys admin could set up an open policy whereby anyone without a token can create an entity. This is an opt-in feature, meaning that if you don't create the policy then API clients will need a token to create an entity, whereas with such a policy in place, the sys admin has the extra flexibility to allow external clients (e.g. devices with limited capabilities) to still push data into context broker.

[c0c0n3]

done. see

• https://github.com/orchestracities/anubis/issues/146
• https://github.com/orchestracities/anubis/issues/148
• https://github.com/orchestracities/anubis/issues/149
• https://github.com/orchestracities/anubis/pull/204
• https://github.com/orchestracities/anubis/pull/206