Bump buidlroot version to 2018.02.6

bsp/buildroot/package/python-crossbar/0002-Rework-runtime-dependencies.patch

@@ -0,0 +1,37 @@
+From 35b2ec4949c9d1620551efde6e3a3d46323899de Mon Sep 17 00:00:00 2001
+From: Yegor Yefremov <yegorslists@googlemail.com>
+Date: Thu, 11 Jan 2018 10:13:18 +0100
+Subject: [PATCH 2/2] Rework runtime dependencies
+
+Add python version requirement to Python2 only packages like
+ipaddress and enum34 and bump h2 package version.
+
+Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
+---
+ requirements-min.txt | 6 +++---
+ 1 file changed, 3 insertions(+), 3 deletions(-)
+
+diff --git a/requirements-min.txt b/requirements-min.txt
+index 83820cd1..5cbf35c4 100644
+--- a/requirements-min.txt
++++ b/requirements-min.txt
+@@ -2,7 +2,7 @@ click>=6.6
+ setuptools>=28.3.0
+ zope.interface>=4.3.2
+ Twisted>=17.1.0
+-h2<3.0.0
++h2>=3.0.1
+ priority>=1.3.0
+ txaio>=2.8.0
+ autobahn>=17.6.2
+@@ -33,5 +33,5 @@ bitstring>=3.1.5
+ attrs>=16.2.0
+ incremental>=16.10.1
+ constantly>=15.1.0
+-enum34>=1.1.6
+-ipaddress>=1.0.18
++enum34>=1.1.6; python_version < '3.4'
++ipaddress>=1.0.18; python_version < '3.3'
+-- 
+2.11.0
+