SERVER-14076 remove replset_remove_node.js as it is redundant and flakey

(cherry picked from commit 4acaf8a26e37986da49d51d14d26b7639699dde6)
SERVER-14829 UpdateIndexData::clear() reset all member variables

(cherry picked from commit d7133440dc8f05f0514d2b056d8605513b6e4d1b)
Merge remote-tracking branch 'upstream/v2.6' into v2.6