patch postgres user .bash_profile

​Hello,

First, thanks a lot for the packaging job you're doing with PostgreSQL :)

I'm sending you a little patch to improve a the usability of the user postgres by adding the binaries to the PATH
variablein its .bash_profile. 

Don't hesitate to comment or criticize but I think it will make the life of user easier, especially those installing
thepackage for the first time. 

I modified the file called postgresql-10-bashprofile, but from what I've seen it's not used yet in the spec file.

Regards,