Description of problem:
-----------------------
Static IP configuration requires some more values required for generating initramfs, without which the proper lookup for tang server will not work.

Following info is required per host and should be collected as part of inventory file:

host_ip_addr:
host_ip_prefix:
host_net_gateway:

Version-Release number of selected component (if applicable):
--------------------------------------------------------------
gluster-ansible-infra-1.0.4-7

How reproducible:
-----------------
Not applicable, there is no support for static IP based deployment

Steps to Reproduce:
-------------------
Not Applicable. This is the request to have few more attributes in the inventory file to support static deployment

Actual results:
---------------
No support for static IP based configuration

Expected results:
-----------------
Support for static IP configuration

--- Additional comment from SATHEESARAN on 2020-04-06 11:51:03 UTC ---


Inventory file should include following 

Global option:
ip_version: 4 or 6 ( defaults to 4, ipv4 )
ip_config_method: static or dhcp ( defaults to dhcp )

Per host:
Only if 'ip_config_method' is 'static', following details makes sense
host_ip_addr: Static IP of the host
host_ip_prefix: network prefix
host_net_gateway: Default network gateway

Dracut drop-in file (Clevis.conf) content for ipv4:

[root@localhost ~]# cat /etc/dracut.conf.d/clevis.conf 
kernel_cmdline="ip={{host_ip_addr}}::{{host_net_gateway}}:{{host_ip_prefix}}::{{interface}}:off"
omit_dracutmodules+="ifcfg"
omit_dracutmodules+="network-legacy"
add_dracutmodules+="clevis network-manager"


Dracut drop-in file (Clevis.conf) content for ipv6:

[root@localhost ~]# cat /etc/dracut.conf.d/clevis.conf 
kernel_cmdline="ip={{[host_ip_addr]}}::{{[host_net_gateway]}}:{{host_ip_prefix}}::{{interface}}:off"
omit_dracutmodules+="ifcfg"
omit_dracutmodules+="network-legacy"
add_dracutmodules+="clevis network-manager"