Add support for SLES 15 SP1

[jambajaar]

What kind of request is this (question/bug/enhancement/feature request):
Feature request

I am able to run nodes on SLES 12.5 per this:
#25067 (comment)

And, would like to run on SLES 15.1. Is this supported?

gz#8917

[aaronyeeski]

Validated with Rancher version 2.4.1

Steps:
Launch instances with the following AMI: ami-05c7da163cde739d0
Start docker service

sudo service docker start
sudo usermod -aG docker ec2-user

Custom cluster validated with existing automation.
HA install validated with 7 nodes (3 etcd, 1 control, 3 worker)

kernel
4.12.14-197.26-default
OS details

ec2-user@ip-172-31-15-221:~> cat /proc/version
Linux version 4.12.14-197.26-default (geeko@buildhost) (gcc version 7.4.1 20190905 [gcc-7-branch revision 275407] (SUSE Linux) ) #1 SMP Wed Nov 6 13:59:49 UTC 2019 (493622b)
ec2-user@ip-172-31-15-221:~> cat /etc/*release
NAME="SLES"
VERSION="15-SP1"
VERSION_ID="15.1"
PRETTY_NAME="SUSE Linux Enterprise Server 15 SP1"
ID="sles"
ID_LIKE="suse"
ANSI_COLOR="0;32"
CPE_NAME="cpe:/o:suse:sles:15:sp1"