RFR: 8278080: Add --with-cacerts-src='user cacerts folder' to enable determinsitic cacerts generation

[Andrew Leonard]

Addition of a configure option --with-cacerts-src='user cacerts folder' to allow developers to specify their own cacerts PEM folder for generation of the cacerts store using the deterministic openjdk GenerateCacerts tool.

Signed-off-by: Andrew Leonard <anleonar at redhat.com>

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Commit messages:
 - 8278080: Add --with-cacerts-src='user cacerts folder' to enable determinsitic cacerts generation
 - 8278080: Add --with-cacerts-src='user cacerts folder' to enable determinsitic cacerts generation

Changes: https://git.openjdk.java.net/jdk/pull/6647/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6647&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8278080
  Stats: 21 lines in 3 files changed: 21 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6647.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6647/head:pull/6647

PR: https://git.openjdk.java.net/jdk/pull/6647