mysqldump causes OOMKIlled error exit code 137

Issue

• When running RHSSO backup script and 3scale backup script, RH-SSO MySQL database dump script failed to complete.
• Noticed the error command terminated with exit code 137 when the mysqldump command is executed.
• Following events were noticed in the sso-mysql pod

Events:
  FirstSeen     LastSeen        Count   From                            SubObjectPath                   Type            Reason          Message
  ---------     --------        -----   ----                            -------------                   --------        ------          -------
  48m           48m             1       kubelet, nodeX.example.com      spec.containers{sso-mysql}      Warning         Unhealthy       Readiness probe errored: rpc error: code = Unknown desc = container not running
  48m           48m             1       kubelet, nodeX.example.com      spec.containers{sso-mysql}      Warning         Unhealthy       Readiness probe failed:
  48m           48m             1       kubelet, nodeX.example.com      spec.containers{sso-mysql}      Normal          Killing         Killing container with id docker://sso-mysql:Container failed liveness probe.. Container will be killed and recreated.