RFR: 8368982: Test sun/security/tools/jarsigner/EC.java completed and timed out

[Mikhail Yankelevich]

Increased a timeout from default 120. Each test runs 25 commands with 5 sec spent on each, so this made it likely that 120 would timeout. I think changing it to 300 would be a nice buffer.

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Commit messages:
 - JDK-8368982: Test sun/security/tools/jarsigner/EC.java completed and timed out

Changes: https://git.openjdk.org/jdk/pull/27695/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27695&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8368982
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/27695.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27695/head:pull/27695

PR: https://git.openjdk.org/jdk/pull/27695