RFC 8299037 Make UseContainerCpuShares true by default for JDK 8u 11u 17u

[Ioi Lam]

WhenJDK-8281181 <https://bugs.openjdk.org/browse/JDK-8281181>was 
backported to 17u and 11u, some users reported that their containerized 
workload experienced OOM.

Although the fix inJDK-8281181 
<https://bugs.openjdk.org/browse/JDK-8281181>is technically "correct" as 
CPU shares shouldn't be used to express a limit (see discussion in the 
CSRJDK-8281571 <https://bugs.openjdk.org/browse/JDK-8281571>), 
unfortunately some workload had been configured that way due to how the 
JDK historically mis-interpreted CPU shares.

Introducing a significant behavioral change in an update release 
probably isn't a good idea.

The proposal is to change the default value of UseContainerCpuShares 
from true to false, so users of update releases up to 17u will need to 
opt into the new behavior.

In the next LTS release, the UseContainerCpuShares flag will have no 
effect. The new behavior will always be used.

(PS, since UseContainerCpuShares has been removed in JDK 21, we may need 
to add it back as an obsolete flag to ease the transition from 17u to 21).
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