[11u] RFR 8224589: Improve startup behavior of SecurityProperties

[Aleksey Shipilev]

Original RFE:
  https://bugs.openjdk.java.net/browse/JDK-8224589
  https://hg.openjdk.java.net/jdk/jdk/rev/e2c952c7ff20

Unfortunately, the backport to 11u is quite messy.

First of all, SecurityProperties.java was added by JDK-8207768 (Improve exception messages during
manifest parsing of jar archives) in 12u. That change is not easily backportable, because it has
compatibility implications.

Then, SecurityProperties.java was improved by JDK-8211860 (Avoid reading security properties eagerly
on Manifest class initialization) in 12. Since the base JDK-8207768 is not backportable, this is not
backportable as well.

Then, we have this particular change. And, it has 11.0.5-oracle backports. So, what is there? I
would guess it applies the relevant bits to the SocketExceptions.java, the block that was moved away
by JDK-8207768:
  https://hg.openjdk.java.net/jdk/jdk/rev/6ffa38b8da65#l4.1

I think the big idea is to provide the fast path when SecurityManager is disabled. The final version
can be seen in jdk/jdk here:

https://hg.openjdk.java.net/jdk/jdk/file/tip/src/java.base/share/classes/sun/security/util/SecurityProperties.java

...which gives us the Frankenstein of 11u backport:
  https://cr.openjdk.java.net/~shade/8224589/webrev.11u.01/

Claes, Ivan, does it capture what Oracle did?

Aside: we can bump this backport to 11.0.6, as it is not critical.

Testing: tier1

-- 
Thanks,
-Aleksey