VPP-319: Fix handling of ERANGE from getgrnam_r
VPP-319: Fix handling of ERANGE from getgrnam_r

Change-Id: I1c5b3ed678622a0352fb881f2236a514743f3c50
Signed-off-by: Ed Warnicke <bd21dacf50ae0c2a81d439ae755251c53052fe92@cisco.com>

chrisy/vpp,milanlenco/vpp,chrisy/vpp,milanlenco/vpp,vpp-dev/vpp,GabrielGanne/vpp-flowtable,chrisy/vpp,GabrielGanne/vpp-flowtable,GabrielGanne/vpp-flowtable,GabrielGanne/vpp-flowtable,vpp-dev/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,milanlenco/vpp,FDio/vpp,FDio/vpp,FDio/vpp,vpp-dev/vpp,FDio/vpp,milanlenco/vpp,vpp-dev/vpp,chrisy/vpp,vpp-dev/vpp,vpp-dev/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,FDio/vpp,vpp-dev/vpp,GabrielGanne/vpp-flowtable,milanlenco/vpp,chrisy/vpp,milanlenco/vpp,GabrielGanne/vpp-flowtable