<fix>[core]: cap client keep-alive below agent socket timeout

[MatheMatrix]

Backport to 5.4.12.

• Jira: ZSTAC-86783, original: ZSTAC-86545 (TIC-5970)
• Cherry-pick of zstack!10364 (5.5.28); one conflict in RESTFacadeImpl.java resolved by dropping unrelated 5.5.x buildBaseUrl/buildCallbackUrl IPv6 helper context — only the fix logic kept
• RESTFacadeImpl: set ConnectionKeepAliveStrategy on the async HttpAsyncClient, capping client connection reuse lifetime below agent cherrypy socket_timeout via new global property RESTFacade.keepAliveTimeMillis (default 5000ms), so the client always recycles idle connections before the agent closes them — eliminates "Connection reset by peer" (error 1015) on reused dead connections
• GlobalPropertyImpact: adds RESTFacade.keepAliveTimeMillis (default 5000)
• • RestFacadeKeepAliveCase groovy case

Verification on 5.4.12 + this fix:

• Full ./runMavenProfile premium: BUILD SUCCESS, 140/140 modules
• RestFacadeKeepAliveCase: Tests run: 1, Failures: 0, Errors: 0 (77s)
• RestFacadeCase (regression): Tests run: 1, Failures: 0, Errors: 0 (87s)
• Original fix QA-verified on 5.5.28 (packet-capture confirmed client FIN before agent timeout, 0 RST)

sync from gitlab !10570

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📒 Files selected for processing (3)

• core/src/main/java/org/zstack/core/CoreGlobalProperty.java
• core/src/main/java/org/zstack/core/rest/RESTFacadeImpl.java
• test/src/test/groovy/org/zstack/test/integration/core/rest/RestFacadeKeepAliveCase.groovy

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