Drop dependency on simplejson

Recent python 3 versions provide the built-in json module which meet
generic requirements. Remove explicit dependency on simplejson and use
the built-in module by default, to reduce external dependencies.

Also fix the missing requests library in requirements.

Depends-on: https://review.opendev.org/920001
Change-Id: Id8d4cec6fe709d1b647281ec4ff76b5104ec88f9

osc_lib/api/api.py

@@ -12,10 +12,9 @@
 #
 
 """Base API Library"""
-
 from keystoneauth1 import exceptions as ksa_exceptions
 from keystoneauth1 import session as ksa_session
-import simplejson as json
+import requests
 
 from osc_lib import exceptions
 from osc_lib.i18n import _
@@ -153,7 +152,7 @@ class BaseAPI(object):
         # Should this move into _requests()?
         try:
             return ret.json()
-        except json.JSONDecodeError:
+        except requests.JSONDecodeError:
             return ret
 
     def delete(self, url, session=None, **params):
@@ -218,7 +217,7 @@ class BaseAPI(object):
             )
         try:
             return ret.json()
-        except json.JSONDecodeError:
+        except requests.JSONDecodeError:
             return ret
 
     # Layered actions built on top of the basic action methods do not

requirements.txt

@@ -8,5 +8,5 @@ keystoneauth1>=3.14.0 # Apache-2.0
 openstacksdk>=0.15.0 # Apache-2.0
 oslo.i18n>=3.15.3 # Apache-2.0
 oslo.utils>=3.33.0 # Apache-2.0
-simplejson>=3.5.1 # MIT
+requests>=2.14.2 # Apache-2.0
 stevedore>=1.20.0 # Apache-2.0