postgres read only UTs fail on ut-extended

unknown file
C++ exception with description "unable to execute PostgreSQL statement <SELECT version, minor FROM schema_version;, reason: ERROR:  permission denied for relation schema_version
" thrown in the test body.

https://jenkins.aws.isc.org/job/kea-dev/job/ut-extended/246/

might need changes to the way hammer sets up read only permissions

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