Modify papi_native_avail to properly handle event names with libpfm4-style  "::" separators in them.
Modify papi_native_avail to properly handle event names with libpfm4-style
 "::" separators in them.

pyrovski/papi,arm-hpc/papi,arm-hpc/papi,arm-hpc/papi,arm-hpc/papi,pyrovski/papi,arm-hpc/papi,pyrovski/papi,pyrovski/papi,arm-hpc/papi,pyrovski/papi,pyrovski/papi,pyrovski/papi,pyrovski/papi,arm-hpc/papi