Adding sanitization for trusts in JobExecution model

Although there is no data model update to JobExecution there are some
minor changes to ensure that trust ids don't leak from the JobExecution
representations.

Changes
* adding sanitizing for trusts to the JobExecution Resource
* adding testing for trusts filter from JobExecution

Partially implement: blueprint edp-swift-trust-authentication
Change-Id: If88bba39efdab01195878a5b1d43bb6c975531b9
Merge "Adding sanitization for trusts in JobExecution model"