Fix PD config incompatible when retrieving dashboard address

[lonng]

Signed-off-by: Lonng [email protected]

What problem does this PR solve?

Fix #637

Fix PD config incompatible when retrieving dashboard address

Manual test:

➜  tiup git:(pr/638) bin/tiup-cluster display simple
TiDB Cluster: simple
TiDB Version: v4.0.3
ID                     Role  Host             Ports        OS/Arch       Status  Data Dir  Deploy Dir
--                     ----  ----             -----        -------       ------  --------  ----------
192.168.137.101:2379   pd    192.168.137.101  2379/2380    linux/x86_64  Up      data      deploy/pd-2379
192.168.137.102:2379   pd    192.168.137.102  2379/2380    linux/x86_64  Up|L    data      deploy/pd-2379
192.168.137.103:2379   pd    192.168.137.103  2379/2380    linux/x86_64  Up|UI   data      deploy/pd-2379
192.168.137.101:4000   tidb  192.168.137.101  4000/10080   linux/x86_64  Up      -         deploy/tidb-4000
192.168.137.101:20160  tikv  192.168.137.101  20160/20180  linux/x86_64  Up      data      deploy/tikv-20160
192.168.137.102:20160  tikv  192.168.137.102  20160/20180  linux/x86_64  Up      data      deploy/tikv-20160
192.168.137.103:20160  tikv  192.168.137.103  20160/20180  linux/x86_64  Up      data      deploy/tikv-20160
➜  tiup git:(pr/638) bin/tiup-cluster display simple --dashboard
http://192.168.137.103:2379/dashboard/

[baurine]

LGTM

[ti-srebot]

@baurine,Thanks for your review. However, LGTM is restricted to Reviewers or higher roles.See the corresponding SIG page for more information. Related SIGs: tiup(slack).

[ti-srebot]

@baurine,Thanks for your review. However, LGTM is restricted to Reviewers or higher roles.See the corresponding SIG page for more information. Related SIGs: tiup(slack).

[codecov-commenter]

Codecov Report

Merging #638 into master will increase coverage by 0.17%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #638      +/-   ##
==========================================
+ Coverage   47.79%   47.97%   +0.17%     
==========================================
  Files         224      224              
  Lines       16818    16824       +6     
==========================================
+ Hits         8038     8071      +33     
+ Misses       7653     7628      -25     
+ Partials     1127     1125       -2     

Flag	Coverage Δ
#coverage	47.97% <ø> (+0.17%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...hub.com/pingcap/tiup/components/playground/main.go	80.83% <0.00%> (+0.59%)	⬆️
...m/pingcap/tiup/components/playground/playground.go	30.33% <0.00%> (+1.12%)	⬆️
...c/github.com/pingcap/tiup/pkg/cluster/api/pdapi.go	54.87% <0.00%> (+2.70%)	⬆️
go/src/github.com/pingcap/tiup/pkg/utils/ioutil.go	47.54% <0.00%> (+10.65%)	⬆️

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