Always require ADT_{AMQP,SWIFT_URL} with ADT_ENABLE

Disabling AMQP requests with "ADT_ENABLE = yes" but ADT_AMQP unset made sense
while we still supported adt-britney. But as that's gone now, let's use the
ADT_ENABLE switch only, and if it's on, require ADT_AMQP and ADT_SWIFT_URL be
set.

This simplifies the code a bit and is less confusing.

autopkgtest.py

@@ -431,11 +431,7 @@ class AutoPackageTest(object):
         for arch in self.britney.options.adt_arches.split():
             arch_queues[arch] = 'debci-%s-%s' % (self.series, arch)
 
-        try:
         amqp_url = self.britney.options.adt_amqp
-        except AttributeError:
-            self.log_error('ADT_AMQP not set, cannot submit requests')
-            return
 
         def _arches(verinfo):
             res = set()
@@ -466,25 +462,13 @@ class AutoPackageTest(object):
         self.update_pending_tests()
 
     def collect(self, packages):
-        # fetch results from swift
-        try:
-            swift_url = self.britney.options.adt_swift_url
-        except AttributeError:
-            self.log_error('ADT_SWIFT_URL not set, cannot collect results')
-            return
-        try:
-            self.britney.options.adt_amqp
-        except AttributeError:
-            self.log_error('ADT_AMQP not set, not collecting results from swift')
-            return
-
         # update results from swift for all packages that we are waiting
         # for, and remove pending tests that we have results for on all
         # arches
         for pkg, verinfo in copy.deepcopy(self.pending_tests.items()):
             for archinfo in verinfo.values():
                 for arch in archinfo:
-                    self.fetch_swift_results(swift_url, pkg, arch)
+                    self.fetch_swift_results(self.britney.options.adt_swift_url, pkg, arch)
         # also update results for excuses whose tests failed, in case a
         # manual retry worked
         for (trigpkg, trigver) in packages:
@@ -492,7 +476,7 @@ class AutoPackageTest(object):
                 for (pkg, arch) in self.failed_tests_for_trigger(trigpkg, trigver):
                     self.log_verbose('Checking for new results for failed %s on %s for trigger %s/%s' %
                                      (pkg, arch, trigpkg, trigver))
-                    self.fetch_swift_results(swift_url, pkg, arch, (trigpkg, trigver))
+                    self.fetch_swift_results(self.britney.options.adt_swift_url, pkg, arch, (trigpkg, trigver))
 
         # update the results cache
         with open(self.results_cache_file + '.new', 'w') as f:

britney.conf

@@ -66,7 +66,6 @@ REMOVE_OBSOLETE   = no
 ADT_ENABLE        = yes
 ADT_DEBUG         = no
 ADT_ARCHES        = amd64 i386
-# comment this to disable autopkgtest requests
 ADT_AMQP          = amqp://test_request:password@162.213.33.228
 # Swift base URL with the results (must be publicly readable and browsable)
 ADT_SWIFT_URL     = https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac

britney_nobreakall.conf

@@ -66,7 +66,6 @@ REMOVE_OBSOLETE   = no
 ADT_ENABLE        = yes
 ADT_DEBUG         = no
 ADT_ARCHES        = amd64 i386
-# comment this to disable autopkgtest requests
 ADT_AMQP          = amqp://test_request:password@162.213.33.228
 # Swift base URL with the results (must be publicly readable and browsable)
 ADT_SWIFT_URL     = https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac

tests/test_autopkgtest.py

@@ -912,12 +912,15 @@ lightgreen 1 i386 green 3
             [r'\bdkms\b.*>1</a> to .*>2<',
              r'autopkgtest for fancy 1: .*amd64.*in progress.*i386.*in progress'])
 
-    def test_no_amqp_config(self):
+    def test_disable_adt(self):
         '''Run without autopkgtest requests'''
 
-        # Disable AMQP server config
+        # Disable AMQP server config, to ensure we don't touch them with ADT
+        # disabled
         for line in fileinput.input(self.britney_conf, inplace=True):
-            if not line.startswith('ADT_AMQP') and not line.startswith('ADT_SWIFT_URL'):
+            if line.startswith('ADT_ENABLE'):
+                print('ADT_ENABLE = no')
+            elif not line.startswith('ADT_AMQP') and not line.startswith('ADT_SWIFT_URL'):
                 sys.stdout.write(line)
 
         self.do_test(