ENH: Partition metadata management APIs and ALTER TABLE support for t…

…able props

See #335, #490, #702, #738

Author: Wes McKinney <wes@cloudera.com>

Closes #739 from wesm/feature/impala-load-data and squashes the following commits:

12bf165 [Wes McKinney] Implement/test alter table properties for unpartitioned tables
ba0eccd [Wes McKinney] Parse storage parameters too
ce605b2 [Wes McKinney] More metadata parsing code
0c13ecc [Wes McKinney] Incomplete describe formatted parser
b24facb [Wes McKinney] Add stub for DESCRIBE FORMATTED metadata parser
4d2dc2d [Wes McKinney] Test stubs
7760eab [Wes McKinney] DDL tests / cleanup for alter table and alter partition
22e9560 [Wes McKinney] Implement add and modify partition, get load_data test running
244a0be [Wes McKinney] Add partition with properties
3860ed3 [Wes McKinney] Move table properties to AlterTable top level DDL
fd688a6 [Wes McKinney] Alter table properties
d541a2a [Wes McKinney] Add API and DDL stubs for add/modify/drop partition functions
fd2dd16 [Wes McKinney] Initial non-working load data test
ebeb86a [Wes McKinney] Slight refactoring to move more code into ImpalaTable class
e89bab9 [Wes McKinney] Add initial DDL generator for LOAD DATA

.gitignore

@@ -51,3 +51,7 @@ testing/udf/CMakeCache.txt
 testing/udf/CMakeFiles/
 testing/udf/Makefile
 .cache/
+
+# test data
+scripts/ibis-testing*
+ibis_testing*