Supersede existing requests if --yes is passed to "osc sr"

This basically reverts commit b2b59ca, because the old code performed
a "no" instead of a "yes" (see also the discussion in
#269).

Fixes: #343 ("'osc sr --yes ...' doesn't supersede existing requests
       as promised")

osc/commandline.py

@@ -1359,17 +1359,19 @@ def _check_service(root):
             return
         supersede_existing = False
         reqs = []
-        if not opts.supersede and not opts.yes:
+        if not opts.supersede:
             (supersede_existing, reqs) = check_existing_requests(apiurl,
                                                                  src_project,
                                                                  src_package,
                                                                  dst_project,
-                                                                 dst_package)
+                                                                 dst_package,
+                                                                 not opts.yes)
             if not supersede_existing:
                (supersede_existing, reqs) = check_existing_maintenance_requests(apiurl,
                                                                  src_project,
                                                                  [src_package],
-                                                                 dst_project, None)
+                                                                 dst_project, None,
+                                                                 not opts.yes)
         if not opts.message:
             difflines = []
             doappend = False

osc/core.py

@@ -4445,11 +4445,13 @@ def get_request_log(apiurl, reqid):
     return data
 
 def check_existing_requests(apiurl, src_project, src_package, dst_project,
-                            dst_package):
+                            dst_package, ask=True):
     reqs = get_exact_request_list(apiurl, src_project, dst_project,
                                   src_package, dst_package,
                                   req_type='submit',
                                   req_state=['new', 'review', 'declined'])
+    if not ask:
+        return True, reqs
     repl = ''
     if reqs:
         print('There are already the following submit request: %s.' % \
@@ -4464,13 +4466,15 @@ def check_existing_requests(apiurl, src_project, src_package, dst_project,
     return repl == 'y', reqs
 
 def check_existing_maintenance_requests(apiurl, src_project, src_packages, dst_project,
-                            release_project):
+                                        release_project, ask=True):
     reqs = []
     for src_package in src_packages:
        reqs += get_exact_request_list(apiurl, src_project, dst_project,
                                   src_package, None,
                                   req_type='maintenance_incident',
                                   req_state=['new', 'review', 'declined'])
+    if not ask:
+        return True, reqs
     repl = ''
     if reqs:
         print('There are already the following maintenance incident request: %s.' % \