dracut.sh: add libgcc_s, if libpthread is installed

workaround the fact, that pthread_cancel() wants to
dlopen libgcc_s.so.1
deprecate "ip=ibft" kernel command line parameter

rd.iscsi.ibft[=1] should be used instead.

Thing is, 'ip=ibft' is not really an ip setting, but rather a marker
that iBFT should be evaluated.

Also removed the trigger of the warning:
"Warning: Please supply bootdev argument for multiple ip= lines"
systemd: Optionally, include efivarsfs module

It is, however not an error if this module can't be found.
98systemd: also install systemd-journald-dev-log.socket

The /dev/log socket was moved to /run on systemd 214, install the
newly added socket unit.
lsinitrd.sh: don't choke on LZO-compressed images

lsinitrd (and hence dracut) currently fail to list the contents of any
LZO-compressed image, and merely spit out misleading xzcat errors.

I guess no-one actually uses them.
lsinird: Adding option "-m|--mod" to list dracut modules in the image

This patch adds option "-m|--mod" to lsinitrd to list dracut
modules in the image  because sometimes  having an option to
only list the dracut modules in the image could be handy.

Sample output:
--------------

[hbathini@localhost dracut]$ sudo ./lsinitrd.sh initramfs-3.11.10-100.fc18.x86_64.img -m
Image: initramfs-3.11.10-100.fc18.x86_64.img: 33M
========================================================================
Version: dracut-029-1.fc18.2

dracut modules:
i18n
network
ifcfg
drm
plymouth
btrfs
crypt
dm
dmraid
kernel-modules
lvm
mdraid
cifs
iscsi
nfs
resume
rootfs-block
terminfo
udev-rules
biosdevname
systemd
usrmount
base
fs-lib
shutdown
========================================================================

Signed-off-by: Hari Bathini <hbathini@linux.vnet.ibm.com>