[READY][FIXED JENKINS-15094] - Handle null parameter values to avoid massive executor deaths

Javadoc: Noting changes in Executor availability check approaches (1.536)

[FIX JENKINS-16264] Don't advertise POSTing config.xml on master

Signed-off-by: NOleg Nenashev <o.v.nenashev@gmail.com>

[FIXES JENKINS-11673] - Support https in RPM service scripts

[FIXED JENKINS-22690]  Remove repo file from RPM

[FIX JENKINS-17114] Distinguish 'nodes offline' from 'no nodes'

[FIX JENKINS-19250] Add causes to queue item tool tip

Signed-off-by: NOleg Nenashev <o.v.nenashev@gmail.com>

[FIX JENKINS-22617] Fix path to deletion of JVM Crash error log

This change is a follow-up to Executor::isAlive() issues in #1229.

Since 1.536, {@link Executor}s start threads on-demand.
The entire logic should use Executor::isActive() instead of Executor::isAlive() in order to check if the {@link Executor} it ready to take tasks.

Since the change breaks previous executor availability flows, it is required to document changes somehow.
Signed-off-by: NOleg Nenashev <o.v.nenashev@gmail.com>

Signed-off-by: NOleg Nenashev <o.v.nenashev@gmail.com>

[FIXED JENKINS-18626] - Test result page keeps identifying tests as age 1

Signed-off-by: NOleg Nenashev <o.v.nenashev@gmail.com>

[FIXED JENKINS-22693] - Properly close InputStreams in FileParameterValue

Signed-off-by: NOleg Nenashev <o.v.nenashev@gmail.com>

[FIXED JENKINS-22934] Show poll thread count option when necessary.

Signed-off-by: NOleg Nenashev <o.v.nenashev@gmail.com>

[FIX JENKINS-8358] Use DISABLED_ANIME icon while building

Signed-off-by: NOleg Nenashev <o.v.nenashev@gmail.com>

[FIXED JENKINS-20031] Useful error message when UC not found

Signed-off-by: NOleg Nenashev <o.v.nenashev@gmail.com>

[JENKINS-20499] Don't fail horribly with null causes

[FIXED JENKINS-15094] - Handle null parameter values in BuildCommand (CLI) and Parameter classes (CLI).

The change adds missing checks for null ParameterValue, which may be passed from the CLI.
It prevents the death of Jenkins executors during the canTake() check of node labels.
Signed-off-by: NOleg Nenashev <o.v.nenashev@gmail.com>

Signed-off-by: NOleg Nenashev <o.v.nenashev@gmail.com>

Changing the number of provided plugins.

The number of provided plugins was outdated.

[FIX JENKINS-22818] fix jenkins restart on Linux after plugin update if the java executable running Jenkins is started without its full path

The patch uses 'execvp' instead of 'execv' to lookup the java executable filename in the PATH if the specified filename does not contain a slash (/) character.
Regression introduced in 547d4ed8

[FIXED JENKINS-22822] PeepholePermalink should maintain an in-memory cache of symlinks to avoid disk I/O.

[JENKINS-20739] Filter descriptors before adding them to hetero-list