RFR: 8329213: Better validation for com.sun.security.ocsp.useget option [v4]

[Aleksey Shipilev]

> [JDK-8328638](https://bugs.openjdk.org/browse/JDK-8328638) introduced a new boolean option, `com.sun.security.ocsp.useget`. We use the usual `Boolean.parseBoolean` to convert it from String to boolean value, which works correctly for `false` and `true` as boolean values. However, any string that is not `true` would be treated as `false`. Which means that if users mistype the value, they would get a `false`, which is a non-default value, which is against the spirit of the JDK-8328638.
> 
> It would be preferable to validate the option range a bit better, and default to the correct value on any error.
> 
> Additional testing:
>   - [x] Eyeballing `GetAndPostTests` debugging, checking that GET/POST are properly enabled/disabled for `false`, `true`, `foobar` passed as option values
>   - [x] `jdk_security`, out of the box
>   - [x] `jdk_security` with `-Dcom.sun.security.ocsp.useget=false` passes
>   - [x] `jdk_security` with `-Dcom.sun.security.ocsp.useget=foobar` passes

Aleksey Shipilev has updated the pull request incrementally with two additional commits since the last revision:

 - test -> client
 - Add another option to GetAndPostTests, check requests in test OSCP server

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/18525/files
  - new: https://git.openjdk.org/jdk/pull/18525/files/b1a03e81..606a384b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18525&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18525&range=02-03

  Stats: 10 lines in 2 files changed: 10 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/18525.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18525/head:pull/18525

PR: https://git.openjdk.org/jdk/pull/18525