Early import qgis in tests to set SIP API

Author: m-kuhn

tests/src/python/test_qgsappstartup.py

@@ -14,6 +14,7 @@
 # This will get replaced with a git SHA1 when you do a git archive
 __revision__ = '$Format:%H$'
 
+import qgis
 from PyQt4 import QtCore
 import sys
 import os

tests/src/python/test_qgsblendmodes.py

@@ -23,6 +23,7 @@
 # This will get replaced with a git SHA1 when you do a git archive
 __revision__ = '$Format:%H$'
 
+import qgis
 import os
 
 from PyQt4.QtCore import QSize

tests/src/python/test_qgscomposition.py

@@ -12,6 +12,7 @@
 # This will get replaced with a git SHA1 when you do a git archive
 __revision__ = '$Format:%H$'
 
+import qgis
 import os
 
 from PyQt4.QtCore import QFileInfo, QDir