AArch64 support: api, cli, controllers, drivers

Enable new architecture 'aarch64' ('arm64' on Ubuntu).
Tested with DEB driver.

Closes-bug: 1638635

Change-Id: I9761322020837186c109c18e849128791ab909d8
Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

packetary/api/repositories.py

@@ -73,7 +73,8 @@ class RepositoryApi(object):
 
         :param config: the configuration
         :param repotype: the kind of repository(deb, yum, etc)
-        :param repoarch: the architecture of repository (x86_64 or i386)
+        :param repoarch: the architecture of repository
+                         (x86_64, i386 or aarch64)
         """
         context = config if isinstance(config, Context) else Context(config)
         return cls(RepositoryController.load(context, repotype, repoarch))

packetary/cli/commands/base.py

@@ -56,7 +56,7 @@ class BaseRepoCommand(BaseCommand):
             '-a',
             '--arch',
             type=str,
-            choices=["x86_64", "i386"],
+            choices=["x86_64", "i386", "aarch64"],
             metavar='ARCHITECTURE',
             default="x86_64",
             help='The target architecture.')

packetary/controllers/repository.py

@@ -45,7 +45,8 @@ class RepositoryController(object):
 
         :param context: the context
         :param driver_name: the name of required driver
-        :param repoarch: the architecture of repository (x86_64 or i386)
+        :param repoarch: the architecture of repository
+                         (x86_64, i386 or aarch64)
         """
         if cls._drivers is None:
             cls._drivers = stevedore.ExtensionManager(

packetary/drivers/deb_driver.py

@@ -48,10 +48,12 @@ _OPERATORS_MAPPING = {
 }
 
 _ARCHITECTURES = {
+    "aarch64": "arm64",
     "x86_64": "amd64",
     "i386": "i386",
     "source": "Source",
     "amd64": "x86_64",
+    "arm64": "aarch64",
 }
 
 _PRIORITIES = {