python-cryptography: 2.1.4 -> 2.2

Upgrade python-cryptography from 2.1.4 to 2.2.

here is the change in LICENSE file thats resulting in checksums changes

-from the same in CPython itself, and is licensed under the terms of the PSF
-License Agreement.
+from CPython, and is licensed under the terms of the PSF License Agreement.

Signed-off-by: Huang Qiyu <huangqy.fnst@cn.fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-python/recipes-devtools/python/python3-cryptography_2.2.bb

@@ -0,0 +1,8 @@
+inherit pypi setuptools3
+require python-cryptography.inc
+
+LDSHARED += "-pthread"
+
+SRC_URI += " \
+    file://run-ptest \
+"