Fix bugs in installer including the following:

Fix bugs in installer including the following:
 - wrong watchdog settings
 - wrong permission settings
 - missing netmask information in pg_hba.conf
 - missing comma in pgpool.conf

Fix to install pgpool to both of node 0 and node 1.
 - install.sh must be executed in both nodes.
 - This is nesessary for installing pgpool_regclass and
   pgpool_recovery to both nodes.
 - In installation on node 1, configuration information on node 0
   is reused. The information is copied using scp. So, users need
   not input the same information.
 - Passwordless access over ssh is setup in install.sh automatically.
   postgres user must exist in both server before installation.