RFR: 8285956: [AIX, BSD] Excessive default poll interval in PollingWatchService.java

[Tyler Steele]

PollingWatchService.java contains the WatchService and WatchKey implementation for AIX and BSD. When a Path is [register](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/nio/file/Path.html#register(java.nio.file.WatchService,java.nio.file.WatchEvent.Kind...))ed this implementation creates a  polling thread to monitor for file system changes. Currently, this thread waits 10 seconds before it's first poll, and then waits 10 seconds between subsequent polls. This interval leads to sluggish performance.

This PR makes the following changes:
- Sets the initial interval to 1 second regardless of the period.
- Change the default period to 1 second.

All tests in `test/jdk/java/nio/file/WatchService` passing.

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Commit messages:
 - Change initial poll delay, and polling interval in

Changes: https://git.openjdk.java.net/jdk/pull/8479/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8479&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8285956
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8479.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8479/head:pull/8479

PR: https://git.openjdk.java.net/jdk/pull/8479