BUG #14980: initddb fails (Issue with postgresql-9.3 initd config)

The following bug has been logged on the website:

Bug reference:      14980
Logged by:          Rameez Iqbal
Email address:      rameez.iqbal@openbet.com
PostgreSQL version: 9.3.20
Operating system:   centos6
Description:        

I couldn't figure out from changelog but looks like
/usr/pgsql-9.3/bin/initdb is now creating data directory if missing and if
already exists then it will throw an error. initdb() function in
/etc/init.d/postgresql-9.3 also creates data directory before calling initdb
which then fails stating data directory already exists. I have remove 'data'
directory creation in service config in order for this work.