tests: bulk changes to avoid whitespace errors of check-code.py

This is a part of preparation to apply checking with check-code.py on
code fragments embedded in *.t test scripts.

This revision avoids "whitespace" errors of check-code.py below:

  - missing whitespace after ","
  - missing whitespace in expression
  - no whitespace around "=" for named parameters
  - wrong whitespace around "="

tests/test-bundle2-pushback.t

@@ -1,120 +1,121 b''
 #testcases sshv1 sshv2
 
 #if sshv2
   $ cat >> $HGRCPATH << EOF
   > [experimental]
   > sshpeer.advertise-v2 = true
   > sshserver.support-v2 = true
   > EOF
 #endif
 
   $ cat > bundle2.py << EOF
   > """A small extension to test bundle2 pushback parts.
   > Current bundle2 implementation doesn't provide a way to generate those
   > parts, so they must be created by extensions.
   > """
   > from __future__ import absolute_import
   > from mercurial import bundle2, exchange, pushkey, util
   > def _newhandlechangegroup(op, inpart):
   >     """This function wraps the changegroup part handler for getbundle.
   >     It issues an additional pushkey part to send a new
   >     bookmark back to the client"""
   >     result = bundle2.handlechangegroup(op, inpart)
   >     if b'pushback' in op.reply.capabilities:
   >         params = {b'namespace': b'bookmarks',
   >                   b'key': b'new-server-mark',
   >                   b'old': b'',
   >                   b'new': b'tip'}
-  >         encodedparams = [(k, pushkey.encode(v)) for (k,v) in params.items()]
+  >         encodedparams = [(k, pushkey.encode(v))
+  >                           for (k, v) in params.items()]
   >         op.reply.newpart(b'pushkey', mandatoryparams=encodedparams)
   >     else:
   >         op.reply.newpart(b'output', data=b'pushback not enabled')
   >     return result
   > _newhandlechangegroup.params = bundle2.handlechangegroup.params
   > bundle2.parthandlermapping[b'changegroup'] = _newhandlechangegroup
   > EOF
 
   $ cat >> $HGRCPATH <<EOF
   > [ui]
   > ssh = "$PYTHON" "$TESTDIR/dummyssh"
   > username = nobody <[e-mail]>
   > 
   > [alias]
   > tglog = log -G -T "{desc} [{phase}:{node|short}]"
   > EOF
 
 Set up server repository
 
   $ hg init server
   $ cd server
   $ echo c0 > f0
   $ hg commit -Am 0
   adding f0
 
 Set up client repository
 
   $ cd ..
   $ hg clone ssh://user@dummy/server client -q
   $ cd client
 
 Enable extension
   $ cat >> $HGRCPATH <<EOF
   > [extensions]
   > bundle2=$TESTTMP/bundle2.py
   > EOF
 
 Without config
 
   $ cd ../client
   $ echo c1 > f1
   $ hg commit -Am 1
   adding f1
   $ hg push
   pushing to ssh://user@dummy/server
   searching for changes
   remote: adding changesets
   remote: adding manifests
   remote: adding file changes
   remote: added 1 changesets with 1 changes to 1 files
   remote: pushback not enabled
   $ hg bookmark
   no bookmarks set
 
   $ cd ../server
   $ hg tglog
   o  1 [public:2b9c7234e035]
   |
   @  0 [public:6cee5c8f3e5b]
   
 
 
 
 With config
 
   $ cd ../client
   $ echo '[experimental]' >> .hg/hgrc
   $ echo 'bundle2.pushback = True' >> .hg/hgrc
   $ echo c2 > f2
   $ hg commit -Am 2
   adding f2
   $ hg push
   pushing to ssh://user@dummy/server
   searching for changes
   remote: adding changesets
   remote: adding manifests
   remote: adding file changes
   remote: added 1 changesets with 1 changes to 1 files
   $ hg bookmark
      new-server-mark           2:0a76dfb2e179
 
   $ cd ../server
   $ hg tglog
   o  2 [public:0a76dfb2e179]
   |
   o  1 [public:2b9c7234e035]
   |
   @  0 [public:6cee5c8f3e5b]