the "dump" attribute is added for the linuximage table
/install/kdump/tmp directory will be created by default when xCAT rpm package is installed;
the "enablekdump" postscript is added for kdump feature
git-svn-id: https://svn.code.sf.net/p/xcat/code/xcat-core/trunk@8396 8638fb3e-16cb-4fca-ae20-7b5d299a9bcd
