pgsql: initdb: Add options --auth-local and --auth-host

initdb: Add options --auth-local and --auth-host

reviewed by Robert Haas and Pavel Stehule

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/8a02339e9ba3f2f962c5967be8c5d053a1fa39d2

Modified Files
--------------
doc/src/sgml/ref/initdb.sgml | 31 ++++++-
src/backend/libpq/pg_hba.conf.sample | 8 +-
src/bin/initdb/initdb.c | 157 ++++++++++++++++++++++------------
3 files changed, 134 insertions(+), 62 deletions(-)