rollback4.js failed waiting for replication

[js_test:rollback4] 2015-11-06T17:33:03.421-0500 assert.soon failed, msg:awaiting replication

[js_test:rollback4] 2015-11-06T17:33:03.421-0500 doassert@src/mongo/shell/assert.js:15:14

[js_test:rollback4] 2015-11-06T17:33:03.421-0500 assert.soon@src/mongo/shell/assert.js:200:13

[js_test:rollback4] 2015-11-06T17:33:03.421-0500 ReplSetTest.prototype.awaitReplication@src/mongo/shell/replsettest.js:551:1

[js_test:rollback4] 2015-11-06T17:33:03.421-0500 @jstests/slow2/rollback4.js:62:1

[js_test:rollback4] 2015-11-06T17:33:03.421-0500 

[js_test:rollback4] 2015-11-06T17:33:03.423-0500 2015-11-06T17:33:03.423-0500 E QUERY    [thread1] Error: assert.soon failed, msg:awaiting replication :

[js_test:rollback4] 2015-11-06T17:33:03.424-0500 doassert@src/mongo/shell/assert.js:15:14

[js_test:rollback4] 2015-11-06T17:33:03.424-0500 assert.soon@src/mongo/shell/assert.js:200:13

[js_test:rollback4] 2015-11-06T17:33:03.424-0500 ReplSetTest.prototype.awaitReplication@src/mongo/shell/replsettest.js:551:1

[js_test:rollback4] 2015-11-06T17:33:03.424-0500 @jstests/slow2/rollback4.js:62:1

[js_test:rollback4] 2015-11-06T17:33:03.424-0500 

[js_test:rollback4] 2015-11-06T17:33:03.427-0500 failed to load: jstests/slow2/rollback4.js