Fix bug in set_java_home. If both java-7-openjdk and java-6-sun were available it was choosing jav-6-sun do to a missing break.  It now chooses java-7-openjdk by default and only falls back to java-6-sum if java-7-openjdk is not available.
Fix bug in set_java_home. If both java-7-openjdk and java-6-sun were available it was choosing jav-6-sun do to a missing break.  It now chooses java-7-openjdk by default and only falls back to java-6-sum if java-7-openjdk is not available.

AchyuthIIIT/mediacloud,berkmancenter/mediacloud,AchyuthIIIT/mediacloud,berkmancenter/mediacloud,berkmancenter/mediacloud,berkmancenter/mediacloud,AchyuthIIIT/mediacloud,AchyuthIIIT/mediacloud,AchyuthIIIT/mediacloud,berkmancenter/mediacloud,AchyuthIIIT/mediacloud,AchyuthIIIT/mediacloud,AchyuthIIIT/mediacloud,AchyuthIIIT/mediacloud