RFR: 8238703: system_profiler command not found

[Prasanta Sadhukhan]

Use absolute path for system_profiler command

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Commit messages:
 - 8238703: system_profiler command not found

Changes: https://git.openjdk.java.net/lanai/pull/53/files
 Webrev: https://webrevs.openjdk.java.net/lanai/53/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8238703
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/lanai/pull/53.diff
  Fetch: git fetch https://git.openjdk.java.net/lanai pull/53/head:pull/53

PR: https://git.openjdk.java.net/lanai/pull/53