Update FCOS iPXE initrd and kernel arg settings

* Add initrd=main kernel argument for UEFI
* Switch to using the coreos.live.rootfs_url kernel argument
instead of passing the rootfs as an appended initrd
* Remove coreos.inst.image_url kernel argument since coreos-installer
now defaults to installing from the embedded live system
* Remove rd.neednet=1 and dhcp=ip kernel args that aren't needed
* Remove serial console kernel args by default (these can be
added via var.kernel_args if needed)

Rel:
* poseidon/matchbox#972 (thank you @bgilbert)
* poseidon/matchbox#978

bare-metal/fedora-coreos/kubernetes/fcc/controller.yaml

@@ -229,7 +229,6 @@ storage:
           ETCD_PEER_CERT_FILE=/etc/ssl/certs/etcd/peer.crt
           ETCD_PEER_KEY_FILE=/etc/ssl/certs/etcd/peer.key
           ETCD_PEER_CLIENT_CERT_AUTH=true
-    - path: /etc/fedora-coreos/iptables-legacy.stamp
     - path: /etc/containerd/config.toml
       overwrite: true
       contents:

bare-metal/fedora-coreos/kubernetes/fcc/worker.yaml

@@ -127,7 +127,6 @@ storage:
           DefaultCPUAccounting=yes
           DefaultMemoryAccounting=yes
           DefaultBlockIOAccounting=yes
-    - path: /etc/fedora-coreos/iptables-legacy.stamp
     - path: /etc/containerd/config.toml
       overwrite: true
       contents:

bare-metal/fedora-coreos/kubernetes/profiles.tf

@@ -1,34 +1,26 @@
 locals {
   remote_kernel = "https://builds.coreos.fedoraproject.org/prod/streams/${var.os_stream}/builds/${var.os_version}/x86_64/fedora-coreos-${var.os_version}-live-kernel-x86_64"
   remote_initrd = [
-    "https://builds.coreos.fedoraproject.org/prod/streams/${var.os_stream}/builds/${var.os_version}/x86_64/fedora-coreos-${var.os_version}-live-initramfs.x86_64.img",
-    "https://builds.coreos.fedoraproject.org/prod/streams/${var.os_stream}/builds/${var.os_version}/x86_64/fedora-coreos-${var.os_version}-live-rootfs.x86_64.img"
+    "--name main https://builds.coreos.fedoraproject.org/prod/streams/${var.os_stream}/builds/${var.os_version}/x86_64/fedora-coreos-${var.os_version}-live-initramfs.x86_64.img",
   ]
 
   remote_args = [
-    "ip=dhcp",
-    "rd.neednet=1",
+    "initrd=main",
+    "coreos.live.rootfs_url=https://builds.coreos.fedoraproject.org/prod/streams/${var.os_stream}/builds/${var.os_version}/x86_64/fedora-coreos-${var.os_version}-live-rootfs.x86_64.img",
     "coreos.inst.install_dev=${var.install_disk}",
     "coreos.inst.ignition_url=${var.matchbox_http_endpoint}/ignition?uuid=$${uuid}&mac=$${mac:hexhyp}",
-    "coreos.inst.image_url=https://builds.coreos.fedoraproject.org/prod/streams/${var.os_stream}/builds/${var.os_version}/x86_64/fedora-coreos-${var.os_version}-metal.x86_64.raw.xz",
-    "console=tty0",
-    "console=ttyS0",
   ]
 
   cached_kernel = "/assets/fedora-coreos/fedora-coreos-${var.os_version}-live-kernel-x86_64"
   cached_initrd = [
     "/assets/fedora-coreos/fedora-coreos-${var.os_version}-live-initramfs.x86_64.img",
-    "/assets/fedora-coreos/fedora-coreos-${var.os_version}-live-rootfs.x86_64.img"
   ]
 
   cached_args = [
-    "ip=dhcp",
-    "rd.neednet=1",
+    "initrd=main",
+    "coreos.live.rootfs_url=${var.matchbox_http_endpoint}/assets/fedora-coreos/fedora-coreos-${var.os_version}-live-rootfs.x86_64.img",
     "coreos.inst.install_dev=${var.install_disk}",
     "coreos.inst.ignition_url=${var.matchbox_http_endpoint}/ignition?uuid=$${uuid}&mac=$${mac:hexhyp}",
-    "coreos.inst.image_url=${var.matchbox_http_endpoint}/assets/fedora-coreos/fedora-coreos-${var.os_version}-metal.x86_64.raw.xz",
-    "console=tty0",
-    "console=ttyS0",
   ]
 
   kernel = var.cached_install ? local.cached_kernel : local.remote_kernel

bare-metal/flatcar-linux/kubernetes/profiles.tf

@@ -18,8 +18,6 @@ resource "matchbox_profile" "flatcar-install" {
     "initrd=flatcar_production_pxe_image.cpio.gz",
     "flatcar.config.url=${var.matchbox_http_endpoint}/ignition?uuid=$${uuid}&mac=$${mac:hexhyp}",
     "flatcar.first_boot=yes",
-    "console=tty0",
-    "console=ttyS0",
     var.kernel_args,
   ])
 
@@ -42,8 +40,6 @@ resource "matchbox_profile" "cached-flatcar-install" {
     "initrd=flatcar_production_pxe_image.cpio.gz",
     "flatcar.config.url=${var.matchbox_http_endpoint}/ignition?uuid=$${uuid}&mac=$${mac:hexhyp}",
     "flatcar.first_boot=yes",
-    "console=tty0",
-    "console=ttyS0",
     var.kernel_args,
   ])