Remove ironic images from excluded list

It looks like as far as building goes, the ironic containers are
fine. So if this passes the gate then this should be fine to merge.

TrivialFix

Change-Id: I646ec301304602b5cdca6de75712b7cffde75a9e

tests/test_build.py

@@ -68,8 +68,6 @@ class BuildTest(object):
 
 class BuildTestCentosBinary(BuildTest, base.BaseTestCase):
     excluded_images = ["murano-base",
-                       "ironic-pxe",
-                       "ironic-inspector",
                        "mistral-base",
                        "murano-base"]
 
@@ -82,8 +80,6 @@ class BuildTestCentosBinary(BuildTest, base.BaseTestCase):
 class BuildTestCentosSource(BuildTest, base.BaseTestCase):
     excluded_images = ["gnocchi-base",
                        "murano-base",
-                       "ironic-pxe",
-                       "ironic-inspector",
                        "mistral-base"]
 
     def setUp(self):
@@ -103,8 +99,6 @@ class BuildTestUbuntuSource(BuildTest, base.BaseTestCase):
 
 class BuildTestOracleLinuxBinary(BuildTest, base.BaseTestCase):
     excluded_images = ["murano-base",
-                       "ironic-pxe",
-                       "ironic-inspector",
                        "mistral-base",
                        "murano-base"]