parameters:
filename:src/test/remu_elect2_test.cc
gtest_enable_pre_vote:1
gtest_interval_check:1
gtest_node_num:5
steps:
step1: start 5 nodes
step2: wait for leader elect
step3: check leader stable
step4: stop leader
step5: wait until elect leader, then wait 5s to ensure leader stable
step6: start the old leader
step7: leader not change, old leader become follower
step8: check log consistant
step9: quit