Use = instead of : in some logging statements.

Attempting to use a more splunk friendly way of logging certain data.
Return request UUID in error response over API.
Use list instead of set for pool update summary.
Log shorter request URI rather than full URL.
Log request UUID and org a little differently.
Log with ISO8601 date format.
Fix spec error from earlier change.
Fix an intermitten spec failure.

Looking up pools for a subscription and assuming the first was the one
we wanted, the virt pool might sometimes be in the list, causing a
rejected entitlement.
Improved and more machine parsable event logging.
Reduce encrypted value parser logging to debug.