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init: add support for rootfstype and rootflags boot options

Add support for two new options in the cmdline.

- rootfstype: Let's you specify the type of filesystem for the root fs
- rootflags: Let's you specify mount options for the root fs - If
  specified, "ro" flag won't be added by default.

This has primarily been setup to be able to boot Alpine guests from a 9P
virtio share and make it easy to change mount options from libvirt/qemu

--- a/initramfs-init.in

+++ b/initramfs-init.in

@@ -387,8 +387,8 @@

 myopts="alpine_dev autodetect autoraid chart cryptroot cryptdm debug_init

 	dma init_args keep_apk_new modules ovl_dev pkgs quiet root_size root

-	usbdelay ip alpine_repo apkovl alpine_start splash blacklist

-	overlaytmpfs"

+	rootfstype rootflags usbdelay ip alpine_repo apkovl alpine_start

+	splash blacklist overlaytmpfs"

 for opt; do

 	case "$opt" in

@@ -551,8 +551,20 @@

 		mount -t tmpfs root-tmpfs /media/root-rw

 		mkdir -p /media/root-rw/work /media/root-rw/root

 		mount -t overlay -o lowerdir=/media/root-ro,upperdir=/media/root-rw/root,workdir=/media/root-rw/work overlayfs $sysroot

+	elif [ -n $KOPT_rootfstype ]; then

+		if [ -n $KOPT_rootflags ]; then

+			rootflags="$KOPT_rootflags"

+		else

+			rootflags="ro"

+		fi

+		retry_mount -t $KOPT_rootfstype -o $rootflags $KOPT_root $sysroot 2>/dev/null

 	else

-		retry_mount -o ro $KOPT_root $sysroot 2>/dev/null

+		if [ -n $KOPT_rootflags ]; then

+			rootflags="$KOPT_rootflags"

+		else

+			rootflags="ro"

+		fi

+		retry_mount -o $rootflags $KOPT_root $sysroot 2>/dev/null

 	fi

 	eend $?