etcdserver: not print password in the warning message of expensive request

[gyuho]

Fix #9635
Replace #9636

ETCDCTL_API=3 ./bin/etcdctl put foo bar
ETCDCTL_API=3 ./bin/etcdctl role add root
ETCDCTL_API=3 ./bin/etcdctl role grant-permission root readwrite foo
ETCDCTL_API=3 ./bin/etcdctl role get root
ETCDCTL_API=3 ./bin/etcdctl --interactive=false user add root:123

{"level":"warn","ts":1525111903.8282323,"caller":"etcdserver/util.go:116","msg":"request took too long","took":0.000198305,"expected-duration":0.1,"prefix":"","request":"header:<ID:7587829900858626564 > put:<key:\"foo\" value:\"bar\" > "}
{"level":"info","ts":1525111943.2119756,"caller":"auth/store.go:788","msg":"created a role","role-name":"root"}
{"level":"warn","ts":1525111943.212163,"caller":"etcdserver/util.go:116","msg":"request took too long","took":0.000222896,"expected-duration":0.1,"prefix":"","request":"header:<ID:7587829900858626565 > auth_role_add:<name:\"root\" > "}
{"level":"info","ts":1525111943.2332838,"caller":"auth/store.go:851","msg":"granted/updated a permission to a user","user-name":"root","permission-name":"READWRITE"}
{"level":"warn","ts":1525111943.2333753,"caller":"etcdserver/util.go:116","msg":"request took too long","took":0.000084734,"expected-duration":0.1,"prefix":"","request":"header:<ID:7587829900858626566 > auth_role_grant_permission:<name:\"root\" perm:<permType:READWRITE key:\"foo\" > > "}
{"level":"warn","ts":1525111943.2436109,"caller":"etcdserver/util.go:116","msg":"request took too long","took":0.000016087,"expected-duration":0.1,"prefix":"","request":"header:<ID:7587829900858626567 > auth_role_get:<role:\"root\" > "}
{"level":"info","ts":1525111943.31909,"caller":"auth/store.go:407","msg":"added a user","user-name":"root"}
{"level":"warn","ts":1525111943.3191411,"caller":"etcdserver/util.go:116","msg":"request took too long","took":0.058392292,"expected-duration":0.1,"prefix":"","request":"header:<ID:7587829900858626568 > auth_user_add:<name:root>"}

[gyuho]

@mitake

[codecov-io]

Codecov Report

Merging #9661 into master will decrease coverage by 0.11%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #9661      +/-   ##
==========================================
- Coverage   68.77%   68.66%   -0.12%     
==========================================
  Files         373      373              
  Lines       34346    34346              
==========================================
- Hits        23621    23582      -39     
- Misses       8994     9030      +36     
- Partials     1731     1734       +3

Impacted Files	Coverage Δ
etcdserver/v3_server.go	75.35% <ø> (ø)	⬆️
etcdserver/apply.go	88.01% <100%> (ø)	⬆️
etcdctl/ctlv2/command/user_commands.go	41.95% <0%> (-13.99%)	⬇️
pkg/fileutil/purge.go	65.9% <0%> (-6.82%)	⬇️
pkg/netutil/netutil.go	63.11% <0%> (-6.56%)	⬇️
pkg/adt/interval_tree.go	87.98% <0%> (-4.51%)	⬇️
etcdserver/api/v3election/election.go	66.66% <0%> (-2.78%)	⬇️
raft/progress.go	94.17% <0%> (-1.95%)	⬇️
rafthttp/msgappv2_codec.go	69.56% <0%> (-1.74%)	⬇️
etcdserver/cluster_util.go	58.29% <0%> (-0.9%)	⬇️
... and 12 more

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[mitake]

@gyuho lgtm, thanks for caring other RPCs!