Use Ubuntu/CentOS agnostic user/group tools
Use Ubuntu/CentOS agnostic user/group tools

Signed-off-by: Tony Hansmann <2c126519f2a6ad76296f425c3012060fde99f90e@pivotallabs.com>

barthy1/bosh,barthy1/bosh,barthy1/bosh,barthy1/bosh