Use linux.system.shell state

https://gerrit.mcp.mirantis.com/25351/ was merged but linux.system.shell
state wasn't included into init.yml and was never used.

This commit fixes this.

Related-Prod: PROD-23581

Change-Id: I89e09247dd2566b8a5b0c0e67e8ca9c789ed57f6
1 file changed