[OMID-110] Support HBase 2.0 - ASF JIRA

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Once ~~OMID-107~~ is committed (which replaced all deprecated methods), the only things I've identified that need to change are:

Instantiation of CellComparator should be done through HBaseShims since it's different between HBase 1.x and 2.x. In HBase 2.0, CellComparator was changed to an interface. Another alternative would be to write our own CellComparator.
```
public static SortedMap<Cell, Optional<Cell>> mapCellsToShadowCells(List<Cell> cells) {

// Move CellComparator to HBaseSims for 2.0 support
// Need to access through CellComparatorImpl.COMPARATOR
SortedMap<Cell, Optional<Cell>> cellToShadowCellMap
= new TreeMap<Cell, Optional<Cell>>(new CellComparator());
```
The HBase 2.0 version would use CellComparatorImpl.COMPARATOR instead of instantiating a CellComparator.
Add createTable method to HBaseShims. Instead of HTableDescriptor, HBase 2.0 uses TableDescriptor and TableDescriptorBuilder. Rajeshbabu Chintaguntla and Ankit Singhal - do you know why existing admin.createTable(HTableDescriptor) wouldn't work? HTableDescriptor implements TableDescriptor.