apache / bookkeeper / 841

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jenkins

[BUG] Fix redundant statistics

### Motivation

Fix redundant statistics, run 5 bookies `bin/bookkeeper localbookie 10`, then show bookieinfo

```
./bin/bookkeeper shell bookieinfo
```

**Wrong result**
```
Free disk space info:
10.101.52.18(10.101.52.18):5004:        Free: 34930151424(34.93GB)      Total: 255850758144(255.85GB)
10.101.52.18(10.101.52.18):5003:        Free: 34930151424(34.93GB)      Total: 255850758144(255.85GB)
10.101.52.18(10.101.52.18):5002:        Free: 34930151424(34.93GB)      Total: 255850758144(255.85GB)
10.101.52.18(10.101.52.18):5000:        Free: 34930151424(34.93GB)      Total: 255850758144(255.85GB)
10.101.52.18(10.101.52.18):5005:        Free: 34930151424(34.93GB)      Total: 255850758144(255.85GB)
Total free disk space in the cluster:   174650757120(174.65GB)
Total disk capacity in the cluster:     1279253790720(1.279TB)
```

**Right result**
```
Free disk space info:
10.101.52.18(10.101.52.18):5004:        Free: 33172185088(33.172GB)     Total: 255850758144(255.85GB)
10.101.52.18(10.101.52.18):5003:        Free: 33172185088(33.172GB)     Total: 255850758144(255.85GB)
10.101.52.18(10.101.52.18):5002:        Free: 33172185088(33.172GB)     Total: 255850758144(255.85GB)
10.101.52.18(10.101.52.18):5006:        Free: 33172185088(33.172GB)     Total: 255850758144(255.85GB)
10.101.52.18(10.101.52.18):5005:        Free: 33172185088(33.172GB)     Total: 255850758144(255.85GB)
Total free disk space in the cluster:   33172185088(33.172GB)
Total disk capacity in the cluster:     255850758144(255.85GB)
```



Reviewers: Jia Zhai <zhaijia@apache.org>, Sijie Guo <None>, Enrico Olivelli <eolivelli@gmail.com>

This closes #2348 from lamber-ken/bk-info-command

10 of 10 new or added lines in 1 file covered. (100.0%)

28438 of 39721 relevant lines covered (71.59%)

0.72 hits per line