RFR: 8281175: Add a -providerPath option to jarsigner [v2]

[Weijun Wang]

> Add the `-providerPath` option to jarsigner to be consistent with keytool.

Weijun Wang has updated the pull request incrementally with one additional commit since the last revision:

  no need to append to null

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7338/files
  - new: https://git.openjdk.java.net/jdk/pull/7338/files/c28d9c1d..99172de5

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7338&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7338&range=00-01

  Stats: 6 lines in 2 files changed: 0 ins; 4 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7338.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7338/head:pull/7338

PR: https://git.openjdk.java.net/jdk/pull/7338