Update the parameter of vc-admission to start with --

[k82cn]

Is this a BUG REPORT or FEATURE REQUEST?:

/kind bug

Description:

The parameter of vc-admission should start with -- to align with other components.

Usage of ./volcano/sbin/vc-admission:
  -alsologtostderr
        log to standard error as well as files
  -ca-cert-file string
        File containing the x509 Certificate for HTTPS.
  -kubeconfig string
        Path to kubeconfig file with authorization and master location information.
  -log_backtrace_at value
        when logging hits line file:N, emit a stack trace
  -log_dir string
        If non-empty, write log files in this directory
  -logtostderr
        log to standard error instead of files
  -master string
        The address of the Kubernetes API server (overrides any value in kubeconfig)
  -mutate-webhook-config-name string
        Name of the mutatingwebhookconfiguration resource in Kubernetes [Deprecated]: it will be generated when not specified.
  -mutate-webhook-name string
        Name of the webhook entry in the webhook config. [Deprecated]: it will be generated when not specified
  -port int
        the port used by admission-controller-server. (default 443)
  -scheduler-name string
        Volcano will handle pods whose .spec.SchedulerName is same as scheduler-name (default "volcano")
  -stderrthreshold value
        logs at or above this threshold go to stderr
  -tls-cert-file string
        File containing the default x509 Certificate for HTTPS. (CA cert, if any, concatenated after server cert).
  -tls-private-key-file string
        File containing the default x509 private key matching --tls-cert-file.
  -v value
        log level for V logs
  -validate-webhook-config-name string
        Name of the mutatingwebhookconfiguration resource in Kubernetes. [Deprecated]: it will be generated when not specified
  -validate-webhook-name string
        Name of the webhook entry in the webhook config. [Deprecated]: it will be generated when not specified
  -version
        Show version and quit
  -vmodule value
        comma-separated list of pattern=N settings for file-filtered logging
  -webhook-namespace string
        The namespace of this webhook (default "default")
  -webhook-service-name string
        The name of this admission service (default "admission-service")