bundle2: urlunquote stream parameter name and value during unbundling

Align to new escaping used during bundling.

mercurial/bundle2.py

@@ -153,6 +153,7 b' class unbundle20(object):'
         if paramssize:
             for p in self._readexact(paramssize).split(' '):
                 p = p.split('=', 1)
+                p = [urllib.unquote(i) for i in p]
                 if len(p) < 2:
                     p.append(None)
                 params[p[0]] = p[1]

tests/test-bundle2.t

@@ -140,3 +140,12 b' Test generation'
 
   $ hg bundle2 --param 'e|! 7/=babar%#==tutu' --param simple
   HG20\x00)e%7C%21%207/=babar%25%23%3D%3Dtutu simple\x00\x00 (no-eol) (esc)
+
+Test unbundling
+
+  $ hg bundle2 --param 'e|! 7/=babar%#==tutu' --param simple | hg unbundle2
+  options count: 2
+  - e|! 7/
+      babar%#==tutu
+  - simple
+  parts count:   0