Fix checks for ibm security classes to work with recent IBM Semeru JDKs #111
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IBM Semeru JDKs no longer ship their own com.ibm.security.* classes and instead ship the standard com.sun.security.* classes. This change checks for the presence of the IBM classes when an IBM JDK is detected and falls back to the standard classes if the IBM classes are not found.
There is currently a work in progress PR in hadoop (apache/hadoop#4537) for the same issue and this PR uses the same approach.