Fix directions for a client-only install, per comments from Alexey Borzov and Vivek Khera.
Fix directions for a client-only install, per comments from Alexey Borzov
and Vivek Khera.

tangp3/gpdb,rubikloud/gpdb,kmjungersen/PostgresXL,janebeckman/gpdb,rvs/gpdb,Chibin/gpdb,lintzc/gpdb,oberstet/postgres-xl,0x0FFF/gpdb,ashwinstar/gpdb,ovr/postgres-xl,zeroae/postgres-xl,Quikling/gpdb,randomtask1155/gpdb,Chibin/gpdb,zaksoup/gpdb,adam8157/gpdb,zaksoup/gpdb,lpetrov-pivotal/gpdb,kaknikhil/gpdb,atris/gpdb,chrishajas/gpdb,Chibin/gpdb,cjcjameson/gpdb,cjcjameson/gpdb,janebeckman/gpdb,edespino/gpdb,atris/gpdb,cjcjameson/gpdb,yazun/postgres-xl,arcivanov/postgres-xl,rvs/gpdb,lintzc/gpdb,50wu/gpdb,tangp3/gpdb,zeroae/postgres-xl,janebeckman/gpdb,edespino/gpdb,greenplum-db/gpdb,lisakowen/gpdb,kmjungersen/PostgresXL,yuanzhao/gpdb,adam8157/gpdb,oberstet/postgres-xl,greenplum-db/gpdb,rubikloud/gpdb,Quikling/gpdb,arcivanov/postgres-xl,kmjungersen/PostgresXL,ahachete/gpdb,xuegang/gpdb,0x0FFF/gpdb,edespino/gpdb,royc1/gpdb,rvs/gpdb,jmcatamney/gpdb,randomtask1155/gpdb,zaksoup/gpdb,lintzc/gpdb,CraigHarris/gpdb,ashwinstar/gpdb,rubikloud/gpdb,50wu/gpdb,zeroae/postgres-xl,Quikling/gpdb,greenplum-db/gpdb,greenplum-db/gpdb,snaga/postgres-xl,tangp3/gpdb,ovr/postgres-xl,lpetrov-pivotal/gpdb,ashwinstar/gpdb,chrishajas/gpdb,Chibin/gpdb,tpostgres-projects/tPostgres,ovr/postgres-xl,techdragon/Postgres-XL,atris/gpdb,chrishajas/gpdb,CraigHarris/gpdb,randomtask1155/gpdb,randomtask1155/gpdb,janebeckman/gpdb,randomtask1155/gpdb,ahachete/gpdb,xinzweb/gpdb,oberstet/postgres-xl,lisakowen/gpdb,arcivanov/postgres-xl,Chibin/gpdb,ahachete/gpdb,ovr/postgres-xl,Postgres-XL/Postgres-XL,CraigHarris/gpdb,kaknikhil/gpdb,ahachete/gpdb,postmind-net/postgres-xl,xinzweb/gpdb,rubikloud/gpdb,kmjungersen/PostgresXL,rubikloud/gpdb,royc1/gpdb,xinzweb/gpdb,postmind-net/postgres-xl,yuanzhao/gpdb,zeroae/postgres-xl,foyzur/gpdb,chrishajas/gpdb,cjcjameson/gpdb,adam8157/gpdb,kaknikhil/gpdb,kaknikhil/gpdb,Quikling/gpdb,randomtask1155/gpdb,Chibin/gpdb,0x0FFF/gpdb,atris/gpdb,rubikloud/gpdb,chrishajas/gpdb,xuegang/gpdb,techdragon/Postgres-XL,50wu/gpdb,edespino/gpdb,rvs/gpdb,CraigHarris/gpdb,foyzur/gpdb,lpetrov-pivotal/gpdb,kaknikhil/gpdb,Quikling/gpdb,CraigHarris/gpdb,yuanzhao/gpdb,ashwinstar/gpdb,tpostgres-projects/tPostgres,yazun/postgres-xl,jmcatamney/gpdb,chrishajas/gpdb,zaksoup/gpdb,0x0FFF/gpdb,Quikling/gpdb,royc1/gpdb,pavanvd/postgres-xl,techdragon/Postgres-XL,50wu/gpdb,xuegang/gpdb,0x0FFF/gpdb,xinzweb/gpdb,Postgres-XL/Postgres-XL,pavanvd/postgres-xl,foyzur/gpdb,xuegang/gpdb,royc1/gpdb,0x0FFF/gpdb,xuegang/gpdb,kaknikhil/gpdb,cjcjameson/gpdb,arcivanov/postgres-xl,jmcatamney/gpdb,greenplum-db/gpdb,snaga/postgres-xl,cjcjameson/gpdb,yazun/postgres-xl,janebeckman/gpdb,randomtask1155/gpdb,tangp3/gpdb,pavanvd/postgres-xl,lisakowen/gpdb,chrishajas/gpdb,xuegang/gpdb,xuegang/gpdb,tpostgres-projects/tPostgres,lintzc/gpdb,Quikling/gpdb,cjcjameson/gpdb,greenplum-db/gpdb,yazun/postgres-xl,cjcjameson/gpdb,oberstet/postgres-xl,edespino/gpdb,Quikling/gpdb,ashwinstar/gpdb,lisakowen/gpdb,xinzweb/gpdb,ovr/postgres-xl,xuegang/gpdb,lisakowen/gpdb,CraigHarris/gpdb,rubikloud/gpdb,lpetrov-pivotal/gpdb,ashwinstar/gpdb,Postgres-XL/Postgres-XL,lintzc/gpdb,rvs/gpdb,lisakowen/gpdb,lintzc/gpdb,yuanzhao/gpdb,50wu/gpdb,kaknikhil/gpdb,Postgres-XL/Postgres-XL,rvs/gpdb,xinzweb/gpdb,atris/gpdb,tangp3/gpdb,atris/gpdb,lpetrov-pivotal/gpdb,postmind-net/postgres-xl,techdragon/Postgres-XL,edespino/gpdb,randomtask1155/gpdb,foyzur/gpdb,adam8157/gpdb,edespino/gpdb,royc1/gpdb,rubikloud/gpdb,Chibin/gpdb,lpetrov-pivotal/gpdb,ahachete/gpdb,kaknikhil/gpdb,yuanzhao/gpdb,foyzur/gpdb,lisakowen/gpdb,adam8157/gpdb,50wu/gpdb,janebeckman/gpdb,atris/gpdb,CraigHarris/gpdb,xuegang/gpdb,adam8157/gpdb,jmcatamney/gpdb,tangp3/gpdb,yuanzhao/gpdb,snaga/postgres-xl,edespino/gpdb,jmcatamney/gpdb,50wu/gpdb,ahachete/gpdb,lpetrov-pivotal/gpdb,lpetrov-pivotal/gpdb,Chibin/gpdb,janebeckman/gpdb,tpostgres-projects/tPostgres,janebeckman/gpdb,tangp3/gpdb,greenplum-db/gpdb,zaksoup/gpdb,atris/gpdb,janebeckman/gpdb,Quikling/gpdb,royc1/gpdb,kaknikhil/gpdb,zaksoup/gpdb,CraigHarris/gpdb,yuanzhao/gpdb,ashwinstar/gpdb,adam8157/gpdb,oberstet/postgres-xl,yuanzhao/gpdb,ashwinstar/gpdb,arcivanov/postgres-xl,greenplum-db/gpdb,postmind-net/postgres-xl,yuanzhao/gpdb,0x0FFF/gpdb,rvs/gpdb,Chibin/gpdb,edespino/gpdb,arcivanov/postgres-xl,zeroae/postgres-xl,tangp3/gpdb,CraigHarris/gpdb,rvs/gpdb,adam8157/gpdb,cjcjameson/gpdb,pavanvd/postgres-xl,jmcatamney/gpdb,janebeckman/gpdb,Postgres-XL/Postgres-XL,jmcatamney/gpdb,yazun/postgres-xl,techdragon/Postgres-XL,foyzur/gpdb,Quikling/gpdb,royc1/gpdb,xinzweb/gpdb,snaga/postgres-xl,rvs/gpdb,cjcjameson/gpdb,snaga/postgres-xl,yuanzhao/gpdb,ahachete/gpdb,lisakowen/gpdb,foyzur/gpdb,zaksoup/gpdb,50wu/gpdb,pavanvd/postgres-xl,0x0FFF/gpdb,Chibin/gpdb,postmind-net/postgres-xl,ahachete/gpdb,chrishajas/gpdb,lintzc/gpdb,lintzc/gpdb,rvs/gpdb,kmjungersen/PostgresXL,tpostgres-projects/tPostgres,jmcatamney/gpdb,foyzur/gpdb,royc1/gpdb,xinzweb/gpdb,edespino/gpdb,lintzc/gpdb,kaknikhil/gpdb,zaksoup/gpdb