Revert "LENS-67 : Fixes ColumnarSQLRewriter for queries with alias names for tables ( Sushil Mohanty via amareshwari)"

This reverts commit f5e5eccc7b9964abc97fde3abd7b22500f7c3833.
LENS-80 : Fixes exceptions in CandidateTableResolver (Rajat Khandelwal via amareshwari)
LENS-84 : Makes sessionid optional in httpresult set (Jaideep Dhok via amareshwari)
LENS-67 : Fixes ColumnarSQLRewriter for queries with alias names for tables ( Sushil Mohanty via amareshwari)
Merge branch 'master' of git://git.apache.org/incubator-lens into LENS-33