log added in case of invalid options provided for the io-threads volume
log added in case of invalid options provided for the io-threads volume

Signed-off-by: Kaushik BV <kaushikbv@gluster.com>
Signed-off-by: Anand V. Avati <avati@dev.gluster.com>

BUG: 1033 (io-threads doesn't log its options)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=1033

Kaushikbv/Gluster,Kaushikbv/Gluster,Kaushikbv/Gluster