Merge pull request !48 from Fengguang/master

- trivial changes caused by
	manual created YAML ==>
	script created YAML

	+---
	 version_control: github
	-src_repo:  yaml/pyyaml
	+src_repo: yaml/pyyaml
	-separator: .
	+separator: "."

- bug fix

	-tag_prefix: ^v
	+tag_prefix: "^"

- add git_url (future manual input just needs this)

	+git_url: https://github.com/yaml/pyyaml.git

- add git tags, prefix-and-ordered by date

	+git_tag:
	+  - 2020-03-18 5.3.1
	+  - 2020-01-06 5.3
	+  - 2018-08-16 4.1-retracted
	+  - 2019-12-21 5.3b1
Signed-off-by: NLiu Shaofei <liushaofei5@huawei.com>
Signed-off-by: NWu Fengguang <wufengguang@huawei.com>

Merge pull request !35 from 薄皮小笼包/master

run test cases while building SPEC file, and solve the problem: AttributeError: 'NoneType' object has no attribute 'drop_database'

Merge pull request !33 from Shinwell_Hu/next

Merge pull request !34 from Shinwell_Hu/upstream_info_update

* 修改VersionType 函数名 _max 为  _compare,提供对外 compare 接口

Merge pull request !25 from solarhu/merge_to_mainline

Merge pull request !39 from gongzhengtang/master

Merge pull request !38 from gongzhengtang/master

Merge pull request !36 from 薄皮小笼包/master

Merge pull request !35 from tomtao/master

Merge pull request !34 from jiangpengjuj/master

Merge pull request !33 from gongzhengtang/master

Merge pull request !32 from 魔箭胖胖/master

Merge pull request !31 from 包成强/master

!30 set interpreter to python3 and solve the "[PY033] 使用docstring描述module、function、class和method接口。docstring必须用三个双引号括起来。" standard scanning problem
Merge pull request !30 from 薄皮小笼包/merge_to_mainline

Merge pull request !25 from 薄皮小笼包/master