create VcfFileReader based on RecordReader

[ChristinaXu2017]

Description

Created a new VcfFileReader based on RecordReader which is created on pull request #209. This reader will replace org.qcmg.vcf.VCFFileReader. The related unit test is created.

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

unit test and regression test

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[holmeso]

looks good