Add TAP tests for client programs

GNUmakefile.in

configure

configure.in

doc/src/sgml/installation.sgml

doc/src/sgml/regress.sgml

src/Makefile.global.in

src/bin/initdb/.gitignore

src/bin/initdb/Makefile

src/bin/initdb/t/001_initdb.pl

src/bin/pg_basebackup/.gitignore

src/bin/pg_basebackup/Makefile

src/bin/pg_basebackup/t/010_pg_basebackup.pl

src/bin/pg_basebackup/t/020_pg_receivexlog.pl

src/bin/pg_config/.gitignore

src/bin/pg_config/Makefile

src/bin/pg_config/t/001_pg_config.pl

src/bin/pg_controldata/.gitignore

src/bin/pg_controldata/Makefile

src/bin/pg_controldata/t/001_pg_controldata.pl

src/bin/pg_ctl/.gitignore