azure: Add JDK installed in vs2015 image to PATH
azure: Add JDK installed in vs2015 image to PATH

Add a JDK installed in vs2015 image to PATH, so java tests can be run

JDK appear to be installed in several places, so we can always pick a
different one:

C:\java\jdk\jdk1.8.0_102\bin\
C:\Program Files\Java\jdk1.8.0_102\bin
C:\Program Files (x86)\Java\jdk1.8.0_102\bin

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