fcoe: wait for lldpad to be ready
network: handle "ip=dhcp6" for all interfaces

https://bugzilla.redhat.com/show_bug.cgi?id=1064365
lsinitrd.sh: prevent < <$() construct

Running dracut in a chroot environment, which has /dev not correctly
setup will result in errors like:

/usr/bin/lsinitrd: line 164: /dev/fd/62: No such file or directory
cpio: Malformed number �5�OK��
cpio: Malformed number 5�OK��
cpio: Malformed number �OK��

This is because bash wants /dev/fd/<num> for constructs like:
foo < <$(bar)
network: DCHPv6: set valid_lft and preferred_lft

https://bugzilla.redhat.com/show_bug.cgi?id=1064365
dm: add dm-cache modules

https://bugzilla.redhat.com/show_bug.cgi?id=1081435
fcoe: workaround fcoe timing issues
fstab: do not mount and fsck from fstab if using systemd

If using systemd in initramfs, we could run into a race condition when
dracut and systemd both are trying to mount and run fsck for the same
filesystem, and mount or fsck could be a failure.

To fix such failure, we should use systemd to mount/fsck from /etc/fstab
only.

v2: check $DRACUT_SYSTEMD suggested by Alexander Tsoy

Signed-off-by: WANG Chao <chaowang@redhat.com>