RFR: 8179502: Enhance OCSP, CRL and Certificate Fetch Timeouts [v4]

[Jamil Nimeh]

> This set of enhancements extends the allowed syntax for the `com.sun.security.ocsp.timeout`, `com.sun.security.crl.timeout` and `com.sun.security.crl.readtimeout` System properties.  These properties retain their current behavior where a purely numeric value is interpreted in seconds, but now the numeric value may also be appended with "ms" (case-insensitive) to be interpreted as milliseconds.
> 
> This enhancement also adds two new System properties: `com.sun.security.cert.timeout` and `com.sun.security.cert.readtimeout` which follow the same new allowed syntax.  These timeouts only come into play when an AIA extension on a certificate is followed for pulling the issuing authority certificate and only when the `com.sun.security.enableAIAcaIssuers` property is true (default false).
> 
> JBS: https://bugs.openjdk.org/browse/JDK-8179502
> CSR: https://bugs.openjdk.org/browse/JDK-8300722

Jamil Nimeh has updated the pull request incrementally with one additional commit since the last revision:

  Use privilegedGetProperty, catch NFE following string match

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Changes:
  - all: https://git.openjdk.org/jdk/pull/13762/files
  - new: https://git.openjdk.org/jdk/pull/13762/files/81c7cb35..e73818ef

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13762&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13762&range=02-03

  Stats: 20 lines in 3 files changed: 12 ins; 0 del; 8 mod
  Patch: https://git.openjdk.org/jdk/pull/13762.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13762/head:pull/13762

PR: https://git.openjdk.org/jdk/pull/13762