RFR: 8266456: Replace direct TKit.run() calls with jdk.jpackage.test.Annotations.Test annotation

[Alexander Matveev]

- Replaced direct TKit.run() calls with Test annotation.
 - Increased timeout for SigningPackageTest from default to 360 due to timeout. This is regression from JDK-8248904 due to changes done in signing and --remove-signature adds additional time since it is run per file.
 - Fixed issue with jtreg.SkippedException which caused test to fail instead of being skipped, since it was wrapped in ExceptionBox.

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

Commit messages:
 - 8266456: Replace direct TKit.run() calls with jdk.jpackage.test.Annotations.Test annotation

Changes: https://git.openjdk.java.net/jdk/pull/3911/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3911&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8266456
  Stats: 214 lines in 12 files changed: 23 ins; 16 del; 175 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3911.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3911/head:pull/3911

PR: https://git.openjdk.java.net/jdk/pull/3911