pin python requirements to major versions rather than patches.

ui/resources/docker/ecs-install-requirements.txt

@@ -1,21 +1,21 @@
-click==6.7
-dotmap==1.2.20
-futures==3.1.1
-httplib2==0.10.3
-ipaddress==1.0.18
-itsdangerous==0.24
-Jinja2==2.9.6
-pager==3.3
-paramiko==2.3.0
-ptpython==0.41
-pycrypto==2.6.1
-pyOpenSSL==17.3.0
-python-ecsclient==1.1.4
-PyYAML==3.12
-requests==2.18.4
-sarge==0.1.4
-simplejson==3.11.1
-six==1.11.0
-urwid==1.3.1
-urwid_timed_progress==1.1.1
-pykwalify==1.6.0
+click>=6.7,<7.0
+dotmap>=1.2.20,<2.0
+futures>=3.1.1,<4.0
+httplib2>=0.10.3,<1.0
+ipaddress>=1.0.18,<2.0
+itsdangerous>=0.24,<1.0
+Jinja2>=2.9.6,<3.0
+pager>=3.3,<4.0
+paramiko>=2.3.0,<3.0
+ptpython>=0.41,<1.0
+pycrypto>=2.6.1,<3.0
+pyOpenSSL>=17.3.0,<18.0
+python-ecsclient>=1.1.5,<2.0
+PyYAML>=3.12,<4.0
+requests>=2.18.4,<3.0
+sarge>=0.1.4,<1.0
+simplejson>=3.11.1,<4.0
+six>=1.11.0,<2.0
+urwid>=1.3.1,<2.0
+urwid_timed_progress>=1.1.1,<2.0
+pykwalify>=1.6.0,<2.0