implement fix for hp-ux version parsing

[SylvainJuge]

What does this PR do?

Fixes #1474

Add an extra runtime property elastic.apm.disable_bootstrap_checks that allows to bypass JVM version check when it's value is set to true.

Checklist

• This is a bugfix
  • I have updated CHANGELOG.asciidoc
  • I have added tests that would fail without this fix
  • I have updated supported JVM version docs
  • I have documented the elastic.apm.disable_bootstrap_checks flag

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Build stats

• Build Cause: [Started by user eyalkoren, Replayed #10]

• Start Time: 2020-11-09T12:04:58.738+0000

• Duration: 45 min 53 sec

Test stats 🧪

Test	Results
Failed	0
Passed	1617
Skipped	12
Total	1629

[codecov-io]

Codecov Report

Merging #1477 into master will increase coverage by 4.80%.
The diff coverage is 63.33%.

@@ Coverage Diff @@ ## master #1477 +/- ## ============================================ + Coverage 59.25% 64.05% +4.80%  - Complexity 92 3101 +3009  ============================================ Files 392 305 -87 Lines 17604 15225 -2379 Branches 2437 2107 -330 ============================================ - Hits 10431 9753 -678  + Misses 6458 4804 -1654  + Partials 715 668 -47 

Impacted Files	Coverage Δ	Complexity Δ
.../main/java/co/elastic/apm/agent/bci/AgentMain.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...java/co/elastic/apm/agent/util/JvmRuntimeInfo.java	81.81% <86.36%> (+3.38%)	25.00 <1.00> (+25.00)
...ic/apm/agent/profiler/collections/LongHashSet.java	16.66% <0.00%> (-1.59%)	12.00% <0.00%> (+12.00%)	⬇️
...t/urlconnection/UrlConnectionPropertyAccessor.java
...nt/dubbo/AlibabaResponseFutureInstrumentation.java
.../springwebmvc/ExceptionHandlerInstrumentation.java
...stic/apm/agent/kafka/BaseKafkaInstrumentation.java
...tic/apm/agent/jsf/JsfLifecycleInstrumentation.java
...ava/co/elastic/apm/opentracing/ElasticApmTags.java
...pentracing/impl/ApmSpanBuilderInstrumentation.java
... and 85 more

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[eyalkoren]

Nice.
We need to document the disable_bootstrap_checks flag somehow.
See suggestion to do that when aborting at startup.

In addition, I think we can at least add it to the NOTE message we have at the supported Java version section.
This section needs to be updated to include these new JVM limitations as well.