fuse: Change "gid-timeout" default value to 2

Originally default value was 0. Changed to 2 for
performance benefits.

Change-Id: Iaadc59cf3ef2a2eb42ff2f6624f466a544fc8074
BUG: 902348
Signed-off-by: Raghavendra Talur <rtalur@redhat.com>
Reviewed-on: http://review.gluster.org/4506
Reviewed-by: Amar Tumballi <amarts@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>