Send notifications about KMS certificate expiration

A notification is generated when the certificate that is used to communicate with the key management service (KMS) server is about to expire.

Following is an example of notification:

The certificate that is used to communicate with the KMS server example,server.com is about to expire in 10 days. If the certificate is not renewed on time, communication with the KMS server fails.

Following is an example of email contents:

Subject: CN=testuser, O=Veritas, OU=safenet

Issuer: CN=InterCA, O=Veritas,OU=safenet

Server: gemalto

Expiry: Wed Sep 21 16:41:32 IST 2022

Days: 973