test-hook: make test compatible with chg

The test uses the 'print' method instead of writing to stdout using
'ui.write' which leads to incompatibility with chg. This commit modifies the
test to use 'ui' instead which fixes the problem.

Test Plan:
Ran the test 'test-hook.t' with and without '--chg' option.

Differential Revision: https://phab.mercurial-scm.org/D927

tests/test-hook.t

@@ -413,20 +413,18 b' preoutgoing hook can prevent outgoing ch'
   > 
   > uncallable = 0
   > 
-  > def printargs(args):
-  >     args.pop('ui', None)
-  >     args.pop('repo', None)
+  > def printargs(ui, args):
   >     a = list(args.items())
   >     a.sort()
-  >     print('hook args:')
+  >     ui.write('hook args:\n')
   >     for k, v in a:
-  >        print(' ', k, v)
+  >        ui.write('  %s %s\n' % (k, v))
   > 
-  > def passhook(**args):
-  >     printargs(args)
+  > def passhook(ui, repo, **args):
+  >     printargs(ui, args)
   > 
-  > def failhook(**args):
-  >     printargs(args)
+  > def failhook(ui, repo, **args):
+  >     printargs(ui, args)
   >     return True
   > 
   > class LocalException(Exception):
@@ -445,7 +443,7 b' preoutgoing hook can prevent outgoing ch'
   >     ui.note('verbose output from hook\n')
   > 
   > def printtags(ui, repo, **args):
-  >     print(sorted(repo.tags()))
+  >     ui.write('%s\n' % sorted(repo.tags()))
   > 
   > class container:
   >     unreachable = 1
@@ -629,8 +627,8 b' make sure --traceback works'
   $ cd c
 
   $ cat > hookext.py <<EOF
-  > def autohook(**args):
-  >     print("Automatically installed hook")
+  > def autohook(ui, **args):
+  >     ui.write('Automatically installed hook\n')
   > 
   > def reposetup(ui, repo):
   >     repo.ui.setconfig("hooks", "commit.auto", autohook)
@@ -666,8 +664,8 b' test python hook configured with python:'
 
   $ cd hooks
   $ cat > testhooks.py <<EOF
-  > def testhook(**args):
-  >     print('hook works')
+  > def testhook(ui, **args):
+  >     ui.write('hook works\n')
   > EOF
   $ echo '[hooks]' > ../repo/.hg/hgrc
   $ echo "pre-commit.test = python:`pwd`/testhooks.py:testhook" >> ../repo/.hg/hgrc