New modification for Hint.

[tristaZero]

Fixes #1289.

Changes proposed in this pull request:

• Delete between Hint API.
• Modify setDataBaseShardingValue API.
• Modify some test cases.

[coveralls]

Pull Request Test Coverage Report for Build 5217

• 12 of 12 (100.0%) changed or added relevant lines in 2 files are covered.
• 20 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.03%) to 62.778%

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Files with Coverage Reduction	New Missed Lines	%
sharding-core/src/main/java/io/shardingsphere/core/api/HintManager.java	1	94.12%
sharding-core/src/main/java/io/shardingsphere/core/executor/sql/prepare/SQLExecutePrepareTemplate.java	19	0.0%

Totals
Change from base Build 5211:	-0.03%
Covered Lines:	8109
Relevant Lines:	12917

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💛 - Coveralls