Refine CRaC restoration logs

[sdeleuze]

As discussed with @wilkinsona, we should refine CRaC restoration logs in order to ensure consistency with Spring Boot and avoid duplicated and inconsistent logging.

With the changes introduced by this issue, the logs for on demand checkpoint/restore of a running application will be:

Restarting Spring-managed lifecycle beans after JVM restore
Tomcat started on port 8080 (http) with context path ''
Spring-managed lifecycle restart completed (restored JVM running for 181 ms)

The logs for automatic checkpoint/restore at startup will be:

Restarting Spring-managed lifecycle beans after JVM restore
Tomcat started on port 8080 (http) with context path ''
Restored Application in 0.11 seconds (process running for 0.112)