GC: Merge branch 'fix_xuserid_optional_for_GC' into 'master'
Make xuserid header optional for GC in the default policies.
See merge request !566 (merged)
(cherry picked from commit 49e04f90)
9b0f7cdc Make xuserid header optional for GC 89b3a09d change empty string to null
Co-authored-by: Yan Sushchynski (EPAM) yan_sushchynski@epam.com