fix(network): broken users_cast

[zeroqn]

What type of PR is this?
fix

What this PR does / why we need it:
fix broken users_cast

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

[muta-bot]

Accept request.

[muta-bot]

Docker builded. "mutadev/muta:3a4d03b"
Run chaos test on k8s named "muta-pr261"
Test lasts 4 hours

[muta-bot]

Date(muta-pr261)	1	2	3	4
2020-04-29T03:00:49.176Z	0	0	0	0
2020-04-29T03:01:49.208Z	34	34	34	34
2020-04-29T03:02:49.243Z	74	74	74	74
2020-04-29T03:03:49.276Z	113	113	113	113
2020-04-29T03:04:49.308Z	152	152	152	152
2020-04-29T03:05:49.340Z	188	188	188	188
2020-04-29T03:06:49.376Z	228	228	228	228
2020-04-29T03:07:49.412Z	267	267	267	267
2020-04-29T03:08:49.444Z	306	306	306	306
2020-04-29T03:09:49.484Z	346	346	346	346
2020-04-29T03:10:49.516Z	382	382	382	382
2020-04-29T03:11:49.552Z	422	422	422	422
2020-04-29T03:12:49.584Z	460	460	460	460
2020-04-29T03:13:49.616Z	500	500	500	500
2020-04-29T03:14:49.652Z	540	540	540	540
2020-04-29T03:15:49.684Z	575	575	575	575
2020-04-29T03:16:49.728Z	614	614	614	614
2020-04-29T03:17:49.760Z	654	654	654	654
2020-04-29T03:18:49.792Z	693	693	693	693
2020-04-29T03:19:49.824Z	732	732	732	732
2020-04-29T03:20:49.860Z	768	768	768	768
2020-04-29T03:21:49.896Z	808	808	808	808
2020-04-29T03:22:49.948Z	846	846	846	846
2020-04-29T03:23:49.984Z	886	886	886	886

{
  "tx_block": "1413.00",
  "sec_block": "2.00",
  "tx_sec": "751.00"
}

[muta-bot]

Accept request.

[muta-bot]

Docker builded. "mutadev/muta:dbfad84"
Run chaos test on k8s named "muta-pr261"

[muta-bot]

Date(muta-pr261)	1	2	3	4
2020-05-06T04:30:16.140Z	0	0	0	0
2020-05-06T04:35:16.176Z	167	168	168	168
2020-05-06T04:40:16.360Z	360	360	360	360
2020-05-06T04:45:16.500Z	550	550	550	550
2020-05-06T04:50:16.664Z	722	722	722	722
2020-05-06T04:55:16.716Z	914	914	914	914
2020-05-06T05:00:16.804Z	1103	1104	1104	1104
2020-05-06T05:05:17.056Z	1297	1297	1297	1297
2020-05-06T05:10:17.116Z	1490	1491	1491	1491
2020-05-06T05:15:17.460Z	1684	1684	1684	1684
2020-05-06T05:20:17.508Z	1876	1876	1876	1876
2020-05-06T05:25:17.556Z	2065	2066	2066	2066
2020-05-06T05:30:17.616Z	2260	2260	2260	2260
2020-05-06T05:35:17.724Z	2453	2453	2453	2453
2020-05-06T05:40:18.168Z	2646	2646	2646	2646
2020-05-06T05:45:18.228Z	2838	2838	2838	2838
2020-05-06T05:50:18.316Z	3032	3032	3032	3032
2020-05-06T05:55:18.416Z	3222	3222	3222	3222
2020-05-06T06:00:18.512Z	3416	3416	3416	3416
2020-05-06T06:05:18.604Z	3608	3608	3608	3608
2020-05-06T06:10:18.736Z	3802	3802	3802	3802
2020-05-06T06:15:18.824Z	3996	3996	3996	3996
2020-05-06T06:20:18.952Z	4183	4183	4183	4183
2020-05-06T06:25:19.008Z	4355	4355	4355	4355

tx_block	sec_block	tx_sec	avg_round
1365.00	2.00	588.00	0.07142857142857142