ENH: minor fixes.

Common/otb_numpy_proc.py

@@ -5,7 +5,7 @@ from time import sleep
 import os, psutil
 from functools import partial
 import string, random
-from gdal import BuildVRT
+from osgeo.gdal import BuildVRT
 
 def randomword(length):
     return ''.join(random.choice(string.ascii_lowercase) for i in range(length))

Common/otb_vector_proc.py

-import gdal, ogr, osr
+from osgeo import gdal, ogr, osr
 import numpy as np
 import otb_numpy_proc
 import otbApplication as otb

TimeSeries/s1base.py

 import otbApplication as otb
-from otb_numpy_proc import to_otb_pipeline
+from Common.otb_numpy_proc import to_otb_pipeline
 import os
 import glob
 import numpy as np