Replace special characters in NRPE commands by empty string
Replace special characters in NRPE commands by empty string

 - replace all non-alphabet, non-numeric characters except '.', '-' and
   '_' by empty string in destination name used in NRPE command
 - the reason is problem with solving such characters on the side of
   NRPE server

zwejra/perun,stavamichal/perun,stavamichal/perun,balcirakpeter/perun,zoraseb/perun,balcirakpeter/perun,mvocu/perun,licehammer/perun,martin-kuba/perun,stavamichal/perun,CESNET/perun,martin-kuba/perun,mvocu/perun,zlamalp/perun,CESNET/perun,zoraseb/perun,martin-kuba/perun,zlamalp/perun,CESNET/perun,stavamichal/perun,zwejra/perun,stavamichal/perun,balcirakpeter/perun,stavamichal/perun,zlamalp/perun,zwejra/perun,martin-kuba/perun,CESNET/perun,balcirakpeter/perun,zoraseb/perun,balcirakpeter/perun,zwejra/perun,licehammer/perun,CESNET/perun,zlamalp/perun,zoraseb/perun,mvocu/perun,zlamalp/perun,licehammer/perun,licehammer/perun,zoraseb/perun,martin-kuba/perun,mvocu/perun,martin-kuba/perun,mvocu/perun,balcirakpeter/perun,mvocu/perun,martin-kuba/perun,zwejra/perun,CESNET/perun,zoraseb/perun,zlamalp/perun,licehammer/perun,zwejra/perun,stavamichal/perun,zlamalp/perun,mvocu/perun,balcirakpeter/perun,licehammer/perun,CESNET/perun