[feat]tools-v2:curve bs delete volume snapshot

[lng2020]

What problem does this PR solve?

Issue Number: #2578

Problem Summary: add curve bs delete volume snapshot command

What is changed and how it works?

What's Changed: ./pkg/cli/command/curvebs/delete/snapshot, ./pkg/cli/command/curvebs/delete/delete.go and ./pkg/config/bs.go

How it Works: Use the filename (path flag) and sequence number to send a deleteSnapShotRequest RPC to remove a snapshot

Side effects(Breaking backward compatibility? Performance regression?):

Check List

• Relevant documentation/comments is changed or added
• I acknowledge that all my contributions will be made under the project's license

[Cyber-SiKu]

cicheck

[Cyber-SiKu]

fix dco error.

[Cyber-SiKu]

The command is best as follows, otherwise it will be confused with copyset

curve bs delete volume snapshot

[Cyber-SiKu]

@lng2020 continue？

[Cyber-SiKu]

curve/tools/snaptool/curltool.py

Lines 57 to 69 in b1eb512

	def delete_or_cancel_snapshot(method, uuid, user, file):
	params = None
	if user and uuid:
	params = {'Action':method, 'Version':'0.0.6', 'User':user, 'UUID':uuid, 'File':file}
	if params is None:
	return -1
	jsonobj = query(params)
	if jsonobj['Code'] != '0':
	print('%s uuid=%s, user=%s failed, ecode=%s, etext=%s' % (method, uuid, user, jsonobj['Code'], errcodelist[jsonobj['Code']]))
	return -1
	print('%s uuid=%s, user=%s success' % (method, uuid, user))
	return 0

What want to achieve is this

[Cyber-SiKu]

add license

delayed

[Cyber-SiKu]

You can refer to this pr

[caoxianfei1]

@lng2020 rebase and fix the conflicts.

[Cyber-SiKu]

What want to achieve is this

There seems to be no modification?

[caoxianfei1]

some conflict to fix.

[caoxianfei1]

another has complete it by taking part in activitiy.

[caoxianfei1]

I will close it. If you have some suggession, can reopen it again.