[YARN-10025] Various improvements in YARN log servlets - ASF JIRA

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There are multiple ways how we can enhance the current log servlets in YARN.

is related to

YARN-4993 Refactory ContainersLogsBlock, AggregatedLogsBlock and container log webservice introduced in AHS to minimize the duplication.

YARN-6080 Create WebServiceUtils to have common functions used in RMWebService, NMWebService and AHSWebService

1.	Remove code duplicates from log servlet utility classes	Open	Adam Antal
2.	Add ability to provide required app information manually for log servlet	Open	Adam Antal
3.	Add ability for ATS (log servlet) to read logs of running apps	Open	Adam Antal
4.	Tail -f style CLI tool for extracting logs of running containers	Open	Adam Antal
5.	Document the new JHS API	Open	Adam Antal
6.	Implement regex querying of logs	Open	Adam Antal
7.	HsWebServices getContainerReport uses loginUser instead of remoteUser to access ApplicationClientProtocol	Open	Tarun Parimi