Merge pull request !50 from 薄皮小笼包/master_design

Merge pull request !43 from gongzhengtang/master

Merge pull request !42 from 薄皮小笼包/master

Merge pull request !41 from 魔箭胖胖/master

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'