Remove legacy leader election

ref: https://issues.redhat.com/browse/ACM-5042
Signed-off-by: Dale Haiducek <19750917+dhaiducek@users.noreply.github.com>

main.go

@@ -78,7 +78,6 @@ type ctrlOpts struct {
  evaluationConcurrency uint8
  enableLease bool
  enableLeaderElection bool
- legacyLeaderElection bool
  enableMetrics bool
 }
 
@@ -243,18 +242,6 @@ func main() {
  ),
  }
 
- if opts.legacyLeaderElection {
- // If legacyLeaderElection is enabled, then that means the lease API is not available.
- // In this case, use the legacy leader election method of a ConfigMap.
- log.Info("Using the legacy leader election of configmaps")
-
- options.LeaderElectionResourceLock = "configmaps"
- } else {
- // use the leases leader election by default for controller-runtime 0.11 instead of
- // the default of configmapsleases (leases is the new default in 0.12)
- options.LeaderElectionResourceLock = "leases"
- }
-
  // Create a new manager to provide shared dependencies and start components
  mgr, err := manager.New(cfg, options)
  if err != nil {
@@ -485,13 +472,6 @@ func parseOpts(flags *pflag.FlagSet, args []string) *ctrlOpts {
  "Enabling this will ensure there is only one active controller manager.",
  )
 
- flags.BoolVar(
- &opts.legacyLeaderElection,
- "legacy-leader-elect",
- false,
- "Use a legacy leader election method for controller manager instead of the lease API.",
- )
-
  flags.Uint8Var(
  &opts.decryptionConcurrency,
  "decryption-concurrency",