vmstat: Provides option to omit first report

The first report from vmstat provides statistics since system boot. This is
often thrown out. Thus, this provides a command line option to omit it. The
program still provides <count> reports.

Signed-off-by: Sanskriti Sharma <sansharm@redhat.com>
1 job for vmstat-skip-first in 2 minutes and 56 seconds (queued for 1 second)
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Status Job ID Name Coverage
  Test
passed #88939915
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