Modify to use standard mode and directory cache for Travis CI build speed up #7043
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Currently build time is about 35-40 minute. However PR's solution is about 20-25 minute + about 1 minute as start time. (actual time see https://travis-ci.org/kazuki43zoo/spring-boot/builds)
And standard mode has an advantage that it's used a latest JDK version(1.8.0_101 at the point of now). (Note: container based mode is used 1.8.0_31 at the point of now)
Please consider to apply this PR.