py3: use fsencode for vcr recording paths and strings for custom_patches args

This fixes phabricator.py's vcrcommand under py3

Differential Revision: https://phab.mercurial-scm.org/D6102

hgext/phabricator.py

@@ -128,7 +128,7 b' def vcrcommand(name, flags, spec, helpca'
     fullflags = flags + _VCR_FLAGS
     def decorate(fn):
         def inner(*args, **kwargs):
-            cassette = kwargs.pop(r'test_vcr', None)
+            cassette = pycompat.fsdecode(kwargs.pop(r'test_vcr', None))
             if cassette:
                 import hgdemandimport
                 with hgdemandimport.deactivated():
@@ -137,8 +137,9 b' def vcrcommand(name, flags, spec, helpca'
                     vcr = vcrmod.VCR(
                         serializer=r'json',
                         custom_patches=[
-                            (urlmod, 'httpconnection', stubs.VCRHTTPConnection),
-                            (urlmod, 'httpsconnection',
+                            (urlmod, r'httpconnection',
+                             stubs.VCRHTTPConnection),
+                            (urlmod, r'httpsconnection',
                              stubs.VCRHTTPSConnection),
                         ])
                     with vcr.use_cassette(cassette):