Recommended update for kdump

This update for kdump fixes the following issues:

- Restore only static routes in kdump initrd (bsc#1093795)
- IP setup: don't bother with IPv4 if there are no addresses (bsc#1062026, bsc#1093795)
- IP setup: pass all routes to kdump environment (bsc#1062026, bsc#1093795)
- IPv6 setup: pass address prefix in a separate dracut argument (bsc#1062026, bsc#1093795)
- Support yes/no style for KDUMP_CONTINUE_ON_ERROR (bsc#1083155)
- Fixes an issue where a crashdump was not possible (bsc#1047609)
- Replaces obsolete perl-Bootloader library with pbl (bsc#1050349)
- Handle additional mounts in the kdump dracut module (bsc#1094581, bsc#1072711)
- Run mkinitrd if fadump is active (bsc#1094581, bsc#1072711)
- Do not touch dracut variables when generating a non-kdump initrd (bsc#1091304, bsc#1094581)

This update was imported from the SUSE:SLE-12-SP3:Update update project.

Fixed bugs
bnc#1083155
KDUMP_CONTINUE_ON_ERROR="true" does not work, i.e. a non zero exit of kdump_prescript stops the system at a kdump bash prompt
bnc#1072711
L3-Question: fadump settings lost by mkinitrd
bnc#1050349
L3: SLES12 SP3 GMC: Error while updating grub using "yast2 kdump" only on single LPAR
bnc#1073972
Trying to reload kdump from a Xen Dom0 results in unloading the panic kernel
bnc#1047609
[HPS Bug] SLES12SP3 RC2 crashdump failure - same system worked with RC1
bnc#1094581
L3: fadump - system cycles through all 640 CPUs then hangs
bnc#1091304
[Build 591.1] openQA test fails in first_boot with "[FAILED] Failed to mount /sysroot."
bnc#1081864
L3-Question: echo c > /proc/sysrq-trigger hangs unless /etc/sysconfig/kdump is touched
bnc#1093795
SLES12 SP3 - [ 4.4.126-94.22-default ]: Kdump/fadump over network fails with error "Network is unreachable". (POWER9/P9)
bnc#1062026
kdump fails with: dracut fatal error unknown value for the configured IPv6 address
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