expire_logs_days returns a float, but is compared as int (l. 592)

[Sylvain Roche]

mysql_variable \'expire_logs_days\' expire_logs_days
returns a float (e.g. 4.00000)

later compared to 0 in
if [ "$expire_logs_days" -eq 0 ] ; then

/usr/local/bin/tuning-primer.sh: ligne 592 : [: 4.000000 : nombre entier attendu comme expression

earlier versions use to crash here, but we were used to fix this with a flot2int call
this function has been removed in current version, which fortunately does not crash anymore here

thanks a lot for the great work on tuning_primer.sh