Fix image usage

[hors]

• if smart update is enabled operator can get the latest
  docker images from VS but after that when user applies CR
  these images can be overwritten

[JNKPercona]

Test name	Status
haproxy	passed
init-deploy	failed
scaling	passed
cross-site	passed
scaling-proxysql	passed
security-context	passed
upgrade-haproxy	passed
storage	passed
recreate	passed
self-healing	passed
restore-to-encrypted-cluster	passed
big-data	passed
scheduled-backup	passed
self-healing-chaos	failed
upgrade-proxysql	passed
smart-update	passed
upgrade-consistency	passed
self-healing-advanced	passed
self-healing-advanced-chaos	failed
demand-backup	passed
limits	passed
monitoring-2-0	passed
affinity	passed
one-pod	passed
auto-tuning	passed
proxysql-sidecar-res-limits	passed
users	passed
tls-issue-self	passed
tls-issue-cert-manager	passed
tls-issue-cert-manager-ref	passed
validation-hook	passed
operator-self-healing	passed
operator-self-healing-chaos	failed
pitr	passed
demand-backup-encrypted-with-tls	failed

commit: 706f792
image: perconalab/percona-xtradb-cluster-operator:PR-1125-706f792a