[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, 8 insertions, 5 deletions

diff --git a/python/run-tests b/python/run-tests
index ed3e819ef3..88b63b84fd 100755
--- a/python/run-tests
+++ b/python/run-tests
@@ -28,6 +28,7 @@ cd "$FWDIR/python"
 
 FAILED=0
 LOG_FILE=unit-tests.log
+START=$(date +"%s")
 
 rm -f $LOG_FILE
 
@@ -35,8 +36,8 @@ rm -f $LOG_FILE
 rm -rf metastore warehouse
 
 function run_test() {
-    echo "Running test: $1" | tee -a $LOG_FILE
-
+    echo -en "Running test: $1 ... " | tee -a $LOG_FILE
+    start=$(date +"%s")
     SPARK_TESTING=1 time "$FWDIR"/bin/pyspark $1 > $LOG_FILE 2>&1
 
     FAILED=$((PIPESTATUS[0]||$FAILED))
@@ -48,6 +49,9 @@ function run_test() {
         echo "Had test failures; see logs."
         echo -en "\033[0m"  # No color
         exit -1
+    else
+        now=$(date +"%s")
+        echo "ok ($(($now - $start))s)"
     fi
 }
 
@@ -161,9 +165,8 @@ if [ $(which pypy) ]; then
 fi
 
 if [[ $FAILED == 0 ]]; then
-    echo -en "\033[32m"  # Green
-    echo "Tests passed."
-    echo -en "\033[0m"  # No color
+    now=$(date +"%s")
+    echo -e "\033[32mTests passed \033[0min $(($now - $START)) seconds"
 fi
 
 # TODO: in the long-run, it would be nice to use a test runner like `nose`.