Add a test for @mixin { @font-face {...} } (#11649)

Change-Id: I7d089ea14b169481f943a1f44058ad47f9b8179a
Prevent showing "Session Expired" notification if navigating away (#12298)

Currently only works if navigation initiated via Page.open(url, "_self").
Page.setLocation should be changed in 7.2 to use "_self" as well (#12925)

Change-Id: I56ad66ffbbd1a83b64999307d23028cbd84bb508
Fixes NPE in TreeTable.setContainerDS(null) (#12928)

Change-Id: I7f3148e51d216dfe20a11c8a5fd922f43cbc673b
Remove broken JSch check

The current check requires ANT_HOME/lib to contain jsch-0.1.48. There are
however other places, like .ant/lib where you can place the jar also. 
Additionally the build agents in TeamCity seems to wipe ANT_HOME/lib 
every now and then, which makes this a bad place to add extra jars.

Change-Id: I83b8e0612e72d422d4341fc68b1ab6a0c98848a5
Fixes double scrollbar issue in browserframes (#11780)
Fixed by adding font-size 0 to the base theme.

Change-Id: I8d0224cb65f8ab36c50d2fd68157de4803c823e2
Merge changes from origin/7.1

30e9b7c Add a test for @mixin { @font-face {...} } (#11649)
0a2cf2c Prevent showing "Session Expired" notification if navigating away (#12298)
8efc385 Fixes NPE in TreeTable.setContainerDS(null) (#12928)
23815e6 Remove broken JSch check
c308d8a Fixes double scrollbar issue in browserframes (#11780) Fixed by adding font-size 0 to the base theme.

Change-Id: I64ae167e8e6b61205718998b80d534fb2cf0cb3d