dracut: s390x disk fix + coredump checks

Use each disk by UUID of underlaying FS, because s390x sometimes swaps vda and vdb.

Add detection of Segmentation Fault by setting custom core_pattern. If coredump found, embed it and its backtrace to HTML report.

@RunTests:dracut_setup,dracut_NM_NFS_root_dhcp,dracut_NM_NFS_root_dhcp_ip_dhcp_neednet,dracut_NM_NFS_root_dhcp_ip_dhcp_peerdns0,dracut_NM_NFS_root_dhcp_vendor_class,dracut_NM_NFS_root_nfs_ip_dhcp_cloned_mac_mtu,dracut_NM_NFS_root_nfs_ip_dhcp_rd_routes,dracut_NM_NFS_root_nfs_ip_manual,dracut_NM_NFS_root_nfs_ip_manual_dhcp,dracut_NM_NFS_root_nfs_ip_manual_gateway_hostname_mac,dracut_NM_NFS_root_nfs_ip_manual_cloned_mac_mtu,dracut_NM_NFS_root_nfs_ip_manual_dns1,dracut_NM_NFS_root_nfs_ip_manual_dns2,dracut_NM_NFS_root_nfs_ip_manual_dns3,dracut_NM_NFS_root_nfs_ip_manual_custom_ifname,dracut_NM_NFS_root_nfs_ip_off,dracut_NM_NFS_root_nfs_ipv6_disable,dracut_NM_NFS_root_nfs_ip_auto6,dracut_NM_NFS_root_nfs_ip_dhcp6,dracut_NM_NFS_root_nfs_ip6_manual_gateway_hostname_mac,dracut_NM_iSCSI_netroot_dhcp,dracut_NM_iSCSI_netroot_dhcp_ip_dhcp,dracut_NM_iSCSI_ibft_table,dracut_NM_iSCSI_multiple_targets,dracut_NM_bridge_eth0,dracut_NM_bridge_custom_name_2_ifaces,dracut_NM_bond_over_2_ifaces,dracut_NM_vlan_over_nic,dracut_NM_vlan_over_everything,dracut_legacy_iSCSI_ibft_table,dracut_clean