Requestor IP address is included in all Audit events

[jvanderhoof]

As a security administrator, I want all audit events to include the requester's IP address so that I can identify the origin of the request that created the audit event.

GIVEN a running Conjur instance
WHEN a request that generates an audit event (or events) is made
THEN those events include the IP address of the requestor ¹

Notes

• We might want to consider using something like Nginx Real IP.

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¹ We'll never be 100% successful at getting the requestor's IP address, but we should strive to achieve this as best we can.