src/libpcp/src/getopt.c: small -H change in pmGetOptions()
src/libpcp/src/getopt.c: small -H change in pmGetOptions()

For -H, defer the "is this PM_OPTFLAG_MULTI" check until we've
seen a second host from the -H hostfile file ... if there is
only one line in hostfile, then there is no error to check for.

adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp