tests: Widely switch to new commit/branch syntax

Lift most test cases to the new syntax, just with few exceptions:
 - tests/test_refspec/test2.yml actually stresses the mixed usage
   (but clean per repo)
 - tests/test_repo_includes references kas as external repo at a point
   where there was no new syntax yet; this needs to be migrated
   differently later on

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

tests/test_patch/test-invalid.yml

@@ -1,12 +1,12 @@
 header:
-  version: 8
+  version: 14
 
 repos:
   this:
 
   kas:
     url: https://github.com/siemens/kas.git
-    refspec: 907816a5c4094b59a36aec12226e71c461c05b77
+    commit: 907816a5c4094b59a36aec12226e71c461c05b77
     patches:
       plain:
         repo: this

tests/test_patch/test-invalid2.yml

@@ -1,10 +1,10 @@
 header:
-  version: 8
+  version: 14
 
 repos:
   kas:
     url: https://github.com/siemens/kas.git
-    refspec: 907816a5c4094b59a36aec12226e71c461c05b77
+    commit: 907816a5c4094b59a36aec12226e71c461c05b77
     patches:
       plain:
         repo: non-existent

tests/test_patch/test-invalid3.yml

@@ -1,12 +1,12 @@
 header:
-  version: 8
+  version: 14
 
 repos:
   this:
 
   kas:
     url: https://github.com/ilbers/isar.git
-    refspec: 47aaeedecd0ea6f754da36be1d10717b04eb8275
+    commit: 47aaeedecd0ea6f754da36be1d10717b04eb8275
     patches:
       plain:
         repo: this

tests/test_patch/test.yml

@@ -1,12 +1,12 @@
 header:
-  version: 8
+  version: 14
 
 repos:
   this:
 
   kas:
     url: https://github.com/siemens/kas.git
-    refspec: 907816a5c4094b59a36aec12226e71c461c05b77
+    commit: 907816a5c4094b59a36aec12226e71c461c05b77
     patches:
       plain:
         repo: this
@@ -17,7 +17,7 @@ repos:
 
   kas-branch:
     url: https://github.com/siemens/kas.git
-    refspec: master
+    branch: master
     patches:
       plain:
         repo: this
@@ -25,7 +25,7 @@ repos:
 
   hello:
     url: https://www.mercurial-scm.org/repo/hello/
-    refspec: 82e55d328c8c
+    commit: 82e55d328c8c
     type: hg
     patches:
       plain:
@@ -37,7 +37,7 @@ repos:
 
   hello-branch:
     url: https://www.mercurial-scm.org/repo/hello/
-    refspec: default
+    branch: default
     type: hg
     patches:
       plain:

tests/test_patch/test2.yml

@@ -1,12 +1,12 @@
 header:
-  version: 8
+  version: 14
 
 repos:
   this:
 
   kas:
     url: https://github.com/siemens/kas.git
-    refspec: master
+    branch: master
     patches:
       plain:
         repo: this
@@ -14,7 +14,7 @@ repos:
 
   kas-branch:
     url: https://github.com/siemens/kas.git
-    refspec: 907816a5c4094b59a36aec12226e71c461c05b77
+    commit: 907816a5c4094b59a36aec12226e71c461c05b77
     patches:
       plain:
         repo: this
@@ -25,7 +25,7 @@ repos:
 
   hello:
     url: https://www.mercurial-scm.org/repo/hello/
-    refspec: default
+    branch: default
     type: hg
     patches:
       plain:
@@ -37,7 +37,7 @@ repos:
 
   hello-branch:
     url: https://www.mercurial-scm.org/repo/hello/
-    refspec: 0a04b987be5a
+    commit: 0a04b987be5a
     type: hg
     patches:
       plain: