merge v0.2.8 features into master

[AionJayT]

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Description

Please include a brief summary of the change that this pull request proposes. Include any relevant motivation and context. List any dependencies required for this change.

• log system enhancement Enhanced logger #502 P2p log enhancement #518
• DB state pruning implement Enabling JournalPruneDataSource #478 Refactor and test journal pruning class #482 Archive states at runtime #498 Archive states & prune refactor #513
• p2p module enhancement and bug fix Improve p2p bind and db lock err msgs #503 P2p outbound #515
• Java API enhancement and bug fix Add getNrgPrice Java API call #500 properly shutdown zmq socket #505 Java Api pack into the release pack #520
• Keystore enhancement Add local.storage.dir flag #516

Type of change

Insert x into the following checkboxes to confirm (eg. [x]):

• Bug fix.
• New feature.
• Breaking change (a fix or feature that causes existing functionality to not work as expected).
• Requires documentation update.

Testing

Please describe the tests you used to validate this pull request. Provide any relevant details for test configurations as well as any instructions to reproduce these results.

• test cases included in the feature implementations

Verification

Insert x into the following checkboxes to confirm (eg. [x]):

• I have self-reviewed my own code and conformed to the style guidelines of this project.
• New and existing tests pass locally with my changes.
• I have added tests for my fix or feature.
• I have made appropriate changes to the corresponding documentation.
• My code generates no new warnings.
• Any dependent changes have been made.