ticket:10017: Get rid of TimeUnitFormat.formatTimePeriod. Just use format method.

git-svn-id: http://source.icu-project.org/repos/icu/icu4j/branches/tkeep@33622 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10017: Merge r33573 to r33622 from trunk.

git-svn-id: http://source.icu-project.org/repos/icu/icu4j/branches/tkeep@33623 251d0590-4201-4cf1-90de-194747b24ca1