Update RedHat startup-script to version 1.7

Add 'afsd -shutdown'  routine
Improve setsysname subroutine
Update SuSE startup-script to version 1.5

add 'afsd -shutdown' routine
improve setsysname subroutine
Update Solaris startup-script to version 1.5

Add 'afsd -shutdown' routine
Merge pull request #30 from eralbru/master

Update startup-scripts for RedHat, SuSe and Solaris