osclib/conf: convert all non-string defaults to string equivalents.

Python3 osc config parsing explodes on non-strings.

osclib/conf.py

@@ -73,7 +73,7 @@ DEFAULT = {
         'lock': 'openSUSE:%(project)s:Staging',
         'lock-ns': 'openSUSE',
         'leaper-override-group': 'leap-reviewers',
-        'delreq-review': None,
+        'delreq-review': '',
         'main-repo': 'standard',
         'pseudometa_package': 'openSUSE:%(project)s:Staging/dashboard',
         'download-baseurl': 'http://download.opensuse.org/distribution/leap/%(version)s/',
@@ -130,7 +130,7 @@ DEFAULT = {
         'staging-archs': 'x86_64',
         'lock': 'openSUSE:%(project)s:Staging',
         'lock-ns': 'openSUSE',
-        'onlyadi': True,
+        'onlyadi': 'True',
         'leaper-override-group': 'backports-reviewers',
         'review-team': 'opensuse-review-team',
         'legal-review-group': 'legal-auto',
@@ -155,20 +155,20 @@ DEFAULT = {
     # Allows devel projects to utilize tools that require config, but not
     # complete StagingAPI support.
     r'(?P<project>.*$)': {
-        'staging': None,
-        'staging-group': None,
+        'staging': '',
+        'staging-group': '',
         'staging-archs': '',
         'staging-dvd-archs': '',
         'staging-required-checks-adi': '',
-        'onlyadi': False,
-        'rings': None,
-        'nonfree': None,
-        'rebuild': None,
-        'product': None,
-        'openqa': None,
-        'lock': None,
-        'lock-ns': None,
-        'delreq-review': None,
+        'onlyadi': '',
+        'rings': '',
+        'nonfree': '',
+        'rebuild': '',
+        'product': '',
+        'openqa': '',
+        'lock': '',
+        'lock-ns': '',
+        'delreq-review': '',
         '_priority': '0', # Apply defaults first
     },
 }