TestJDKStringConverters::test_InetAddress is too restrictive in its expected output

[advayDev1]

Unit test failure using the Android/J2ObjC implementation of JRE:

2) test_InetAddress(org.joda.convert.TestJDKStringConverters)
01:31:12.470 [ERROR] [org.gradle.BuildExceptionReporter]   org.junit.ComparisonFailure: expected:
<2001:db8:85a3:[0:0]:8a2e:370:7334> but was:<2001:db8:85a3:[]:8a2e:370:7334>

Per the official Java JDK docs, the result 2001:db8:85a3::8a2e:370:7334 is also valid, and this test should accept both answers as correct.

cc @tomball @dlew - you mentioned in #7 that some tests were failing with the J2objc JRE emul; we're working through them here: j2objc-contrib/j2objc-common-libs-e2e-test#46; this particular issue seems to be an issue with the test; the others seem like genuine differences between a conforming JRE and the J2ObjC JRE.

cc @brunobowden

[advayDev1]

This is against your latest released v1.8 @jodastephen