Add Fedora support for snp.sh setup-host

1. Changed AMDSEV URL and AMDSEV branch for AMDSEV build with RHEL fixes
   for snp kernel package build in fedora

2. fedora_install_dependencies for fedora library package manager dependencies for AMDSEV branch.

3. set_grub_default_snp() using grubby tool for fedora

4. Modified save_binary_paths() due to the differences in the location of guest kernel file path for ubuntu and fedora and differences in the boot menu for initial ram disk images(initd.img-<kernel-version> for ubuntu and initramfs-<kernel-version> for fedora)

Signed-off-by: Harika <lnittala@amd.com>