HPCC-10593 Add a pseudo dali client so default coven is always valid

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>
HPCC-10593 Allow environment to be read when not connected to dali

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>