fxpackager unit tests fail on macOS 10.12

Five of the fxpackager unit tests fail when run on macOS 10.12 (Sierra). We are in the process of switching our production build to 10.12.6 in support of the most recent WebKit upgrade.

To reproduce this, run the following on FX 8u-dev:

$ gradle test
...
:fxpackager:test

com.oracle.tools.packager.mac.MacAppBundlerTest > testJRE FAILED
    java.lang.AssertionError:
        at org.junit.Assert.fail(Assert.java:91)
        at org.junit.Assert.assertTrue(Assert.java:43)
        at org.junit.Assert.assertNotNull(Assert.java:524)
        at org.junit.Assert.assertNotNull(Assert.java:535)
        at com.oracle.tools.packager.mac.MacAppBundlerTest.testJRE(MacAppBundlerTest.java:756)

com.oracle.tools.packager.mac.MacAppBundlerTest > minimumConfig FAILED
    java.lang.AssertionError:
        at org.junit.Assert.fail(Assert.java:91)
        at org.junit.Assert.assertTrue(Assert.java:43)
        at org.junit.Assert.assertNotNull(Assert.java:524)
        at org.junit.Assert.assertNotNull(Assert.java:535)
        at com.oracle.tools.packager.mac.MacAppBundlerTest.minimumConfig(MacAppBundlerTest.java:526)

com.oracle.tools.packager.mac.MacAppBundlerTest > quarantinedAppTest FAILED
    java.lang.AssertionError:
        at org.junit.Assert.fail(Assert.java:91)
        at org.junit.Assert.assertTrue(Assert.java:43)
        at org.junit.Assert.assertNotNull(Assert.java:524)
        at org.junit.Assert.assertNotNull(Assert.java:535)
        at com.oracle.tools.packager.mac.MacAppBundlerTest.quarantinedAppTest(MacAppBundlerTest.java:480)

com.oracle.tools.packager.mac.MacPkgBundlerTest > minimumConfig FAILED
    java.lang.AssertionError:
        at org.junit.Assert.fail(Assert.java:91)
        at org.junit.Assert.assertTrue(Assert.java:43)
        at org.junit.Assert.assertNotNull(Assert.java:524)
        at org.junit.Assert.assertNotNull(Assert.java:535)
        at com.oracle.tools.packager.mac.MacPkgBundlerTest.minimumConfig(MacPkgBundlerTest.java:357)

com.oracle.tools.packager.mac.MacPkgBundlerTest > quarantinedAppTest FAILED
    java.lang.AssertionError:
        at org.junit.Assert.fail(Assert.java:91)
        at org.junit.Assert.assertTrue(Assert.java:43)
        at org.junit.Assert.assertNotNull(Assert.java:524)
        at org.junit.Assert.assertNotNull(Assert.java:535)
        at com.oracle.tools.packager.mac.MacPkgBundlerTest.quarantinedAppTest(MacPkgBundlerTest.java:308)