LLAP: Fix failing tests in MiniLlapCluster

After HIVE-11776 commit, some tests are showing diffs and some are failing in llap. Following is the current state of failures

ql/src/test/results/clientpositive/llap/acid_vectorization_partition.q.out (query result ordering difference)
ql/src/test/results/clientpositive/llap/auto_join_nulls.q.out (Operator Id difference)
ql/src/test/results/clientpositive/llap/auto_sortmerge_join_6.q.out (explain output difference)
ql/src/test/results/clientpositive/llap/constprog_dpp.q.out (different plan. User explain vs regular explain)
ql/src/test/results/clientpositive/llap/explainuser_1.q.out (stats difference)
ql/src/test/results/clientpositive/llap/fileformat_mix.q.out (pre/post hook output difference)
ql/src/test/results/clientpositive/llap/identity_project_remove_skip.q.out (partition column value difference and hybridgrace join enabled)
ql/src/test/results/clientpositive/llap/insert1.q.out (stage ordering difference)
ql/src/test/results/clientpositive/llap/join0.q.java1.8.out (type of join difference and explain plan difference)
ql/src/test/results/clientpositive/llap/metadata_only_queries_with_filters.q.out (prehook difference and query result difference)
ql/src/test/results/clientpositive/llap/unionDistinct_1.q.out (stats difference)
ql/src/test/results/clientpositive/llap/vector_leftsemi_mapjoin.q.out (stats difference)
ql/src/test/results/clientpositive/llap/vector_multi_insert.q.out (stats difference)
ql/src/test/results/clientpositive/llap/vector_outer_join1.q.out (stats difference)
ql/src/test/results/clientpositive/llap/vector_outer_join2.q.out (stats difference)
ql/src/test/results/clientpositive/llap/vector_outer_join3.q.out (stats difference)
ql/src/test/results/clientpositive/llap/vector_outer_join4.q.out (stats difference)
Following queries failed to run in llap
metadataonly1.q
optimize_nullscan.q
union_view.q
vector_cast_constant.q (run in java 7 and java 8)
vector_decimal_precision.q
vector_left_outer_join3.q
vector_outer_join.q.out
vectorized_parquet_types.q.out
vectorized_timestamp_ints_casts.q.out