fixed backtrace lines cutting
fixed backtrace lines cutting

binary:part fails when you try to 'cut' binary to same size. So we
need less or equal instead of just less.

Change-Id: I044631f1f0e3fb8f71b64b2c14e6f7d31e669f04
Reviewed-on: http://review.membase.org/6461
Tested-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>
Reviewed-by: Bin Cui <ed18693fff32c00e22495f4877a3b901bed09041@gmail.com>

mschoch/ns_server,vzasade/ns_server,membase/ns_server,mschoch/ns_server,vzasade/ns_server,nimishzynga/ns_server,t3rm1n4l/ns_server,daverigby/ns_server,ceejatec/ns_server,pavel-blagodov/ns_server,t3rm1n4l/ns_server,daverigby/ns_server,nimishzynga/ns_server,membase/ns_server,pavel-blagodov/ns_server,mschoch/ns_server,t3rm1n4l/ns_server,mschoch/ns_server,nimishzynga/ns_server,pavel-blagodov/ns_server,daverigby/ns_server,ceejatec/ns_server,membase/ns_server,vzasade/ns_server,ceejatec/ns_server,membase/ns_server,daverigby/ns_server,t3rm1n4l/ns_server,pavel-blagodov/ns_server,membase/ns_server,mschoch/ns_server,membase/ns_server,nimishzynga/ns_server,nimishzynga/ns_server,mschoch/ns_server,ceejatec/ns_server,nimishzynga/ns_server,daverigby/ns_server,t3rm1n4l/ns_server,ceejatec/ns_server,vzasade/ns_server,ceejatec/ns_server