[SPARK-6953] [PySpark] speed up python tests

This PR try to speed up some python tests:

```
tests.py                       144s -> 103s      -41s
mllib/classification.py         24s -> 17s        -7s
mllib/regression.py             27s -> 15s       -12s
mllib/tree.py                   27s -> 13s       -14s
mllib/tests.py                  64s -> 31s       -33s
streaming/tests.py             185s -> 84s      -101s
```
Considering python3, the total saving will be 558s (almost 10 minutes) (core, and streaming run three times, mllib runs twice).

During testing, it will show used time for each test file:
```
Run core tests ...
Running test: pyspark/rdd.py ... ok (22s)
Running test: pyspark/context.py ... ok (16s)
Running test: pyspark/conf.py ... ok (4s)
Running test: pyspark/broadcast.py ... ok (4s)
Running test: pyspark/accumulators.py ... ok (4s)
Running test: pyspark/serializers.py ... ok (6s)
Running test: pyspark/profiler.py ... ok (5s)
Running test: pyspark/shuffle.py ... ok (1s)
Running test: pyspark/tests.py ... ok (103s)   144s
```

Author: Reynold Xin <rxin@databricks.com>
Author: Xiangrui Meng <meng@databricks.com>

Closes #5605 from rxin/python-tests-speed and squashes the following commits:

d08542d [Reynold Xin] Merge pull request #14 from mengxr/SPARK-6953
89321ee [Xiangrui Meng] fix seed in tests
3ad2387 [Reynold Xin] Merge pull request #5427 from davies/python_tests

1 files changed, 4 insertions, 3 deletions

diff --git a/python/pyspark/shuffle.py b/python/pyspark/shuffle.py
index b54baa57ec..1d0b16cade 100644
--- a/python/pyspark/shuffle.py
+++ b/python/pyspark/shuffle.py
@@ -486,7 +486,7 @@ class ExternalSorter(object):
         goes above the limit.
         """
         global MemoryBytesSpilled, DiskBytesSpilled
-        batch, limit = 100, self._next_limit()
+        batch, limit = 100, self.memory_limit
         chunks, current_chunk = [], []
         iterator = iter(iterator)
         while True:
@@ -497,7 +497,7 @@ class ExternalSorter(object):
                 break
 
             used_memory = get_used_memory()
-            if used_memory > self.memory_limit:
+            if used_memory > limit:
                 # sort them inplace will save memory
                 current_chunk.sort(key=key, reverse=reverse)
                 path = self._get_path(len(chunks))
@@ -513,13 +513,14 @@ class ExternalSorter(object):
                 chunks.append(load(open(path, 'rb')))
                 current_chunk = []
                 gc.collect()
+                batch //= 2
                 limit = self._next_limit()
                 MemoryBytesSpilled += (used_memory - get_used_memory()) << 20
                 DiskBytesSpilled += os.path.getsize(path)
                 os.unlink(path)  # data will be deleted after close
 
             elif not chunks:
-                batch = min(batch * 2, 10000)
+                batch = min(int(batch * 1.5), 10000)
 
         current_chunk.sort(key=key, reverse=reverse)
         if not chunks: