remove length in ShmSocket ctor, not used.

lichao

2021-06-01 f7f8fbc85c48b003d1e3094a94a3528001977977

 .gitignore

@@ -9,4 +9,5 @@
*/bhshmq_center
*/help
*/bhshmqbox
*/bhshmq_status
*/bhshmq_status
.idea