SERVER-8707 Sleep 10 seconds before entering ReplicaSetMonitorWatcher's loop

This restores the startup timing that was changed by commit
e3b8349ec305b00bdb7107f2d887549640a15c90, while preserving the
smaller time window within the loop between checking for
termination and calling ReplicaSetMonitor::checkAll().
SERVER-10120 remove2.js buildbot timeout too aggressive
SERVER-10437 remove chaining.js test

It is testing functionality that has been deprecated by the new sync source updater.
Also, tags.js covers testing chaining with network failures, so there is no further
need for this test.  chaining.js is racy with respect to the way it activates a
failpoint in the socket class, which was causing the test to fail sometimes.
SERVER-10429 disable flaky test until we can fix it properly