Add reboot to the standard mode

[mofelee]

It needs to be rebooted to make the WireGuard kernel module available.

[githubixx]

Thanks! A few comments inline. Please also update README.md accordingly. Also please add an entry to CHANGELOG.md about what was changed. As this actually changes the behavior of for the CentOS 7 users it makes sense to have a new major version number. So it would be 14.0.0.

[mofelee]

@githubixx
I think it's okay now.

[githubixx]

I just did a Molecule deployment without your pull request and it worked without issues. There is also a task that loads the Wireguard kernel module: https://github.com/githubixx/ansible-role-wireguard/blob/master/tasks/main.yml#L23-L34

So at least a fresh CentOS 7 installation works without reboot. Maybe it makes more sense to make the reboot optional because it's not needed in all cases?

[mofelee]

In my case, if I don't reboot CentOS 7, it cannot pass through the 'Enable WireGuard kernel module' task.

> cat /etc/os-release 
NAME="CentOS Linux"
VERSION="7 (Core)"
ID="centos"
ID_LIKE="rhel fedora"
VERSION_ID="7"
PRETTY_NAME="CentOS Linux 7 (Core)"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:centos:centos:7"
HOME_URL="https://www.centos.org/"
BUG_REPORT_URL="https://bugs.centos.org/"

CENTOS_MANTISBT_PROJECT="CentOS-7"
CENTOS_MANTISBT_PROJECT_VERSION="7"
REDHAT_SUPPORT_PRODUCT="centos"
REDHAT_SUPPORT_PRODUCT_VERSION="7"

> uname -a
Linux xx.local 3.10.0-957.1.3.el7.x86_64 #1 SMP Thu Nov 29 14:49:43 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

> cat /etc/centos-release
CentOS Linux release 7.6.1810 (Core)

> lsb_release
LSB Version:	:core-4.1-amd64:core-4.1-noarch

[mofelee]

I've reproduced this error on this ISO file.

http://bay.uchicago.edu/centos-vault/7.6.1810/isos/x86_64/CentOS-7-x86_64-Minimal-1810.iso

http://bay.uchicago.edu/centos-vault/7.6.1810/isos/x86_64/