Network service fails to start with errors "action: command not found" and "apply_sysctl: command not found"

Issue

• Network service fails to start

# systemctl restart network
Job for network.service failed because the control process exited with error code. See "systemctl status network.service" and "journalctl -xe" for details.

• There are errors such as the below:

Nov 22 15:14:58 fastvm-rhel-7-4-179 network[19354]: ./network-functions: line 14: /etc/init.d/functions: No such file or directory
Nov 22 15:14:58 fastvm-rhel-7-4-179 network[19354]: /etc/rc.d/init.d/network: line 62: apply_sysctl: command not found
Nov 22 15:14:58 fastvm-rhel-7-4-179 network[19354]: /etc/rc.d/init.d/network: line 70: action: command not found
Nov 22 15:14:58 fastvm-rhel-7-4-179 network[19354]: /etc/rc.d/init.d/network: line 127: action: command not found
Nov 22 15:14:58 fastvm-rhel-7-4-179 network[19354]: ./network-functions: line 14: /etc/init.d/functions: No such file or directory
Nov 22 15:14:58 fastvm-rhel-7-4-179 network[19354]: /etc/rc.d/init.d/network: line 155: apply_sysctl: command not found