Keypair file is always removed by ipa-getcert-request

[BrianSipos]

Certmonger itself supports re-using an existing keypair file and the puppet module documentation implies similar behavior when discussing key strengths being used only if needed. The module however currently always removes any private keypair file before making a request, as in the following snippit:

  $cmd_getcert_request = @("EOT"/)
    rm -rf ${keyfile} ${certfile} ; mkdir -p `dirname ${keyfile}` `dirname ${certfile}` ; \

The removal of the ${keyfile} file could be removed here to allow a keyfile to exist as a precondition to using getcert request.