setup_gpadmin_user.bash: Determine TEST_OS empirically
setup_gpadmin_user.bash: Determine TEST_OS empirically

Signed-off-by: David Sharp <2664301c0a809f94c834d0a9c6cef510e103d89b@pivotal.io>

Quikling/gpdb,50wu/gpdb,lisakowen/gpdb,Chibin/gpdb,greenplum-db/gpdb,50wu/gpdb,xinzweb/gpdb,jmcatamney/gpdb,ashwinstar/gpdb,kaknikhil/gpdb,jmcatamney/gpdb,kaknikhil/gpdb,yuanzhao/gpdb,50wu/gpdb,Chibin/gpdb,janebeckman/gpdb,xinzweb/gpdb,greenplum-db/gpdb,Chibin/gpdb,janebeckman/gpdb,ashwinstar/gpdb,greenplum-db/gpdb,ashwinstar/gpdb,Quikling/gpdb,ashwinstar/gpdb,xinzweb/gpdb,rvs/gpdb,edespino/gpdb,edespino/gpdb,xinzweb/gpdb,janebeckman/gpdb,edespino/gpdb,ashwinstar/gpdb,adam8157/gpdb,rvs/gpdb,janebeckman/gpdb,rvs/gpdb,Chibin/gpdb,jmcatamney/gpdb,cjcjameson/gpdb,janebeckman/gpdb,janebeckman/gpdb,rvs/gpdb,edespino/gpdb,Chibin/gpdb,lisakowen/gpdb,rvs/gpdb,Quikling/gpdb,rvs/gpdb,janebeckman/gpdb,kaknikhil/gpdb,rvs/gpdb,jmcatamney/gpdb,edespino/gpdb,50wu/gpdb,janebeckman/gpdb,cjcjameson/gpdb,lisakowen/gpdb,adam8157/gpdb,cjcjameson/gpdb,kaknikhil/gpdb,lisakowen/gpdb,50wu/gpdb,greenplum-db/gpdb,adam8157/gpdb,yuanzhao/gpdb,50wu/gpdb,cjcjameson/gpdb,kaknikhil/gpdb,lisakowen/gpdb,xinzweb/gpdb,rvs/gpdb,cjcjameson/gpdb,xinzweb/gpdb,ashwinstar/gpdb,Chibin/gpdb,cjcjameson/gpdb,yuanzhao/gpdb,janebeckman/gpdb,edespino/gpdb,ashwinstar/gpdb,jmcatamney/gpdb,yuanzhao/gpdb,adam8157/gpdb,greenplum-db/gpdb,xinzweb/gpdb,Chibin/gpdb,kaknikhil/gpdb,cjcjameson/gpdb,yuanzhao/gpdb,lisakowen/gpdb,kaknikhil/gpdb,jmcatamney/gpdb,xinzweb/gpdb,Quikling/gpdb,Quikling/gpdb,kaknikhil/gpdb,adam8157/gpdb,cjcjameson/gpdb,janebeckman/gpdb,ashwinstar/gpdb,jmcatamney/gpdb,yuanzhao/gpdb,cjcjameson/gpdb,adam8157/gpdb,kaknikhil/gpdb,adam8157/gpdb,lisakowen/gpdb,edespino/gpdb,50wu/gpdb,cjcjameson/gpdb,jmcatamney/gpdb,Quikling/gpdb,Quikling/gpdb,kaknikhil/gpdb,yuanzhao/gpdb,50wu/gpdb,Chibin/gpdb,yuanzhao/gpdb,Chibin/gpdb,Chibin/gpdb,edespino/gpdb,lisakowen/gpdb,adam8157/gpdb,rvs/gpdb,edespino/gpdb,edespino/gpdb,Quikling/gpdb,Quikling/gpdb,yuanzhao/gpdb,rvs/gpdb,greenplum-db/gpdb,yuanzhao/gpdb,greenplum-db/gpdb,Quikling/gpdb,greenplum-db/gpdb