[Linux] Setup service dependency

For some service, it might have some inter-dependency on other background service. In order to setup it’s relationship, it need to alter the service file as below.

[Unit]
Description=crypto-man.service PRD CloudHSM
After=cloudhsm-client.service
Requires=cloudhsm-client.service
....

Property After means it will start after service started; Required means if dependent service not start, it won’t be start.