Updating our autest suite to require Python3.6

AuTest 1.8.1, which we require (see tests/Pipfile), uses features new to
Python 3.6 such as type hints. We therefore already have required 3.6
for a few weeks. This just updates our scripts to enforce this.

tests/README.md

@@ -44,7 +44,7 @@ To run autest manually, the recommended way is to follow these steps:
 
 AuTest and the relevant tools can be install manually instead of using the wrapper script. By doing this, it is often easier to debug issues with the testing system, or the tests. There are two ways this can be done.
 1. Run the bootstrap script then source the path with a "source ./env-test/bin/activate" command. At this point autest command should run without the wrapper script
-2. Make sure you install python 3.5 or better on your system. From there install these python packages ( ie pip install ):
+2. Make sure you install python 3.6 or better on your system. From there install these python packages ( ie pip install ):
   - hyper
   - git+https://bitbucket.org/autestsuite/reusable-gold-testing-system.git
   - [traffic-replay](https://bitbucket.org/autestsuite/trafficreplay/src/master/) (This will automatically install [MicroDNS](https://bitbucket.org/autestsuite/microdns/src/master/), [MicroServer](https://bitbucket.org/autestsuite/microserver/src/master/), [TrafficReplayLibrary](https://bitbucket.org/autestsuite/trafficreplaylibrary/src/master/), and dnslib as part of the dependencies.)

tests/gold_tests/autest-site/init.cli.ext

@@ -18,11 +18,11 @@
 
 import sys
 
-if sys.version_info < (3, 5, 0):
+if sys.version_info < (3, 6, 0):
     host.WriteError(
-        "You need python 3.5 or later to run these tests\n", show_stack=False)
+        "You need python 3.6 or later to run these tests\n", show_stack=False)
 
-autest_version = "1.7.2"
+autest_version = "1.8.1"
 if AuTestVersion() < autest_version:
     host.WriteError(
         "Tests need AuTest version {ver} or better\n Please update AuTest:\n  pip install --upgrade autest\n".format(ver=autest_version), show_stack=False)

tests/test-env-check.sh

@@ -20,15 +20,15 @@
 python3 - << _END_
 import sys
 
-if sys.version_info.major < 3 or sys.version_info.minor < 5:
+if sys.version_info.major < 3 or sys.version_info.minor < 6:
     exit(1)
 _END_
 
 if [ $? = 1 ]; then
-    echo "Python 3.5 or newer is not installed/enabled."
+    echo "Python 3.6 or newer is not installed/enabled."
     return
 else
-    echo "Python 3.5 or newer detected!"
+    echo "Python 3.6 or newer detected!"
 fi
 
 # check for python development header -- for autest