mongod can already communicate with mongot in a "pinning mode" when getting more from a cursor - meaning the same mongod always communicates to the same mongot across different calls. This work was enabled by george.wangensteen@mongodb.com in SPM-3147.

In this ticket we want to make connection pinning between mongod and mongot the default / always happen (unless explicitly specified as a start-up configuration). This should be possible by changing the default configuration parameter here

Also we want to change the testing suite 'mongo/buildscripts/resmokeconfig/suites/search_pinned_connections.yml' to test no pinning instead, as the default suite 'mongo/buildscripts/resmokeconfig/suites/search.yml' will now test in pinning mode as it is the default.