问题：poa和pos类共识配置如果init_proposer参数为空会导致panic或者节点无法出块的错误

[wangchao0222]

Description

问题：poa和pos类共识配置如果init_proposer参数为空会导致panic或者节点无法出块的错误

Fixes # (issue)

解决：poa和pos类共识实例创建的时候增加init_proposer参数校验，校验失败返回错误

Type of change

Please delete options that are not relevant.

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

Brief of your solution

poa和pos类共识实例创建的时候增加init_proposer参数校验，校验失败返回错误

How Has This Been Tested?

升级到poa和pos类共识时desc文件内部缺少init_proposer参数会导致共识升级失败 错误日志标签：

1. 升级到tdpos：init_proposer is required 或者 init_proposer["1"] is required
2. 升级到poa：init_proposer.address is required

[codecov-commenter]

Codecov Report

Merging #301 (ad5b3da) into master (4956854) will decrease coverage by 0.03%. The diff coverage is 12.50%.

@@            Coverage Diff             @@
##           master     #301      +/-   ##
==========================================
- Coverage   46.52%   46.48%   -0.04%     
==========================================
  Files         136      136              
  Lines       12191    12199       +8     
==========================================
- Hits         5672     5671       -1     
- Misses       5348     5355       +7     
- Partials     1171     1173       +2     

Impacted Files	Coverage Δ
bcs/consensus/xpoa/xpoa.go	55.44% <0.00%> (-0.88%)	:arrow_down:
bcs/consensus/tdpos/common.go	55.07% <20.00%> (-2.75%)	:arrow_down:
bcs/network/p2pv2/server.go	51.33% <0.00%> (-1.07%)	:arrow_down:

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