KYLIN-4921: New rowkey for streamv2 source config and fix bug that can't create same name table in diff project

[liukun4515]

Proposed changes

use the new row key path to identify the stream source config path.
fix the bug: the other stream source config will be deleted by mistake, when creating the stream table failed.

The design doc

Types of changes

What types of changes does your code introduce to Kylin?
Put an x in the boxes that apply

• Bugfix (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)
• Documentation Update (if none of the other choices apply)

Checklist

Put an x in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your code.

• I have create an issue on Kylin's jira, and have described the bug/feature there in detail
• Commit messages in my PR start with the related jira ID, like "KYLIN-0000 Make Kylin project open-source"
• Compiling and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• If this change need a document change, I will prepare another pr against the document branch
• Any dependent changes have been merged

Further comments

If this is a relatively large or complex change, kick off the discussion at user@kylin or dev@kylin by explaining why you chose the solution you did and what alternatives you considered, etc...

[liukun4515]

@hit-lacus PTAL

[coveralls]

Pull Request Test Coverage Report for Build 6949

• 4 of 85 (4.71%) changed or added relevant lines in 12 files are covered.
• 13 unchanged lines in 6 files lost coverage.
• Overall coverage decreased (-0.01%) to 27.942%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
server-base/src/main/java/org/apache/kylin/rest/controller/TableController.java	0	1	0.0%
server-base/src/main/java/org/apache/kylin/rest/service/ProjectService.java	0	1	0.0%
stream-receiver/src/main/java/org/apache/kylin/stream/server/StreamingServer.java	0	1	0.0%
stream-source-kafka/src/main/java/org/apache/kylin/stream/source/kafka/KafkaBatchSourceAdaptor.java	0	1	0.0%
server-base/src/main/java/org/apache/kylin/rest/service/TableService.java	0	2	0.0%
server-base/src/main/java/org/apache/kylin/rest/service/StreamingV2Service.java	0	4	0.0%
stream-source-kafka/src/main/java/org/apache/kylin/stream/source/kafka/KafkaSource.java	0	5	0.0%
stream-core/src/main/java/org/apache/kylin/stream/core/source/StreamingSourceConfig.java	0	8	0.0%
tool/src/main/java/org/apache/kylin/tool/CubeMigrationCLI.java	0	9	0.0%
server-base/src/main/java/org/apache/kylin/rest/controller/StreamingV2Controller.java	0	14	0.0%

Files with Coverage Reduction	New Missed Lines	%
server-base/src/main/java/org/apache/kylin/rest/controller/StreamingV2Controller.java	1	0%
server-base/src/main/java/org/apache/kylin/rest/service/TableService.java	1	10.89%
tool/src/main/java/org/apache/kylin/tool/query/ProbabilityGenerator.java	1	81.58%
stream-core/src/main/java/org/apache/kylin/stream/core/source/StreamingSourceConfigManager.java	2	0%
tool/src/main/java/org/apache/kylin/tool/CubeMigrationCLI.java	3	0%
core-cube/src/main/java/org/apache/kylin/cube/inmemcubing/MemDiskStore.java	5	77.81%

Totals
Change from base Build 6948:	-0.01%
Covered Lines:	26255
Relevant Lines:	93961

---

💛 - Coveralls

[hit-lacus]

Approved

[liukun4515]

The design doc

[liukun4515]

@xiaowangyu I have added the design doc, PTAL

[hit-lacus]

New dev documentation looks great to me, could please copy them to related JIRA issue page, thank you.