Description of problem:
a. Name of Feature: [RHEL7 FEAT] dracut kdump adaptation
b. Feature Description:
  Current kdump mkdumprd is somehow duplication of dracut functions. It
added extra maintainace effort. Plan is moving from mkdumprd to dracut
for kdump initrd generation, thus we can also sync fedora/rhel kdump
more easily.

  This feature need dracut provide following functions:
  1. infrastructure for mounting disks/nfs as other than root/usr
  2. give a kdump target, dracut can detect and deal with the dracut
module dependencies, ie. nfs/lvm/iscsi/...

c. Feture Details:

TODOs for dracut disk mounting:
Copied from
https://docs.google.com/document/d/16V5KUUslXR-69HUlgeLH4_LIqpZcEUER0EnE_qWnXGQ/edit

Generator
module-setup.sh
extend host only functions to detect additional non-root devices also
extend host only functions to add configuration files for non-root
devices also
additional modules
1. ssh with scp
dracut
add options:
1. --mount "<dev>" "<somewhere>" “<fstype>” “<fsoptions>”
2. --add-fstab “<fstab file>"
Initramfs scripts
dracut-lib.sh
add_mount_point           <disk> <mountpoint> <filesystem> <fsopts>
Mount <disk> on <mountpoint> with <filesystem> and <fsopts> and call any
mount hooks, as soon, as it is mounted


inst_mount_hook        <mountpoint> <prio> <script>
Install a mount hook with priority <prio>, which executes <script> as
soon as <mountpoint> is mounted.


wait_for_mount         <mountpoint>
Installs a initqueue-finished script, which will cause the main loop
only to exit, if <mountpoint> is mounted.


wait_for_disk         <disk>
Installs a initqueue-finished script, which will cause the main loop
only to exit, if the device <disk> is recognized by the system.

d. Relavant info:

https://fedoraproject.org/wiki/Features/NewMkdumprd


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