bookmark: use bundle2 debug output in one push tests

Having more details about the push process will help to track changes made to
the actual exchange.

tests/test-bookmarks-pushpull.t

@@ -103,12 +103,98 b' export bookmark by name'
 delete a remote bookmark
 
   $ hg book -d W
-  $ hg push -B W ../a --config "$TESTHOOK"
+  $ hg push -B W ../a --config "$TESTHOOK" --debug --config devel.bundle2.debug=yes
   pushing to ../a
+  query 1; heads
   searching for changes
+  all remote heads known locally
+  listing keys for "phases"
+  checking for updated bookmarks
+  listing keys for "bookmarks"
   no changes found
+  bundle2-output-bundle: "HG20", 3 parts total
+  bundle2-output: start emission of HG20 stream
+  bundle2-output: bundle parameter: 
+  bundle2-output: start of parts
+  bundle2-output: bundle part: "replycaps"
+  bundle2-output-part: "replycaps" 185 bytes payload
+  bundle2-output: part 0: "REPLYCAPS"
+  bundle2-output: header chunk size: 16
+  bundle2-output: payload chunk size: 185
+  bundle2-output: closing payload chunk
+  bundle2-output: bundle part: "check:phases"
+  bundle2-output-part: "check:phases" 48 bytes payload
+  bundle2-output: part 1: "CHECK:PHASES"
+  bundle2-output: header chunk size: 19
+  bundle2-output: payload chunk size: 48
+  bundle2-output: closing payload chunk
+  bundle2-output: bundle part: "pushkey"
+  bundle2-output-part: "pushkey" (params: 4 mandatory) empty payload
+  bundle2-output: part 2: "PUSHKEY"
+  bundle2-output: header chunk size: 90
+  bundle2-output: closing payload chunk
+  bundle2-output: end of bundle
+  bundle2-input: start processing of HG20 stream
+  bundle2-input: reading bundle2 stream parameters
+  bundle2-input-bundle: with-transaction
+  bundle2-input: start extraction of bundle2 parts
+  bundle2-input: part header size: 16
+  bundle2-input: part type: "REPLYCAPS"
+  bundle2-input: part id: "0"
+  bundle2-input: part parameters: 0
+  bundle2-input: found a handler for part replycaps
+  bundle2-input-part: "replycaps" supported
+  bundle2-input: payload chunk size: 185
+  bundle2-input: payload chunk size: 0
+  bundle2-input-part: total payload size 185
+  bundle2-input: part header size: 19
+  bundle2-input: part type: "CHECK:PHASES"
+  bundle2-input: part id: "1"
+  bundle2-input: part parameters: 0
+  bundle2-input: found a handler for part check:phases
+  bundle2-input-part: "check:phases" supported
+  bundle2-input: payload chunk size: 48
+  bundle2-input: payload chunk size: 0
+  bundle2-input-part: total payload size 48
+  bundle2-input: part header size: 90
+  bundle2-input: part type: "PUSHKEY"
+  bundle2-input: part id: "2"
+  bundle2-input: part parameters: 4
+  bundle2-input: found a handler for part pushkey
+  bundle2-input-part: "pushkey" (params: 4 mandatory) supported
+  pushing key for "bookmarks:W"
+  bundle2-input: payload chunk size: 0
+  bundle2-input: part header size: 0
+  bundle2-input: end of bundle2 stream
+  bundle2-input-bundle: 2 parts total
+  running hook txnclose-bookmark.test: sh $TESTTMP/hook.sh
   test-hook-bookmark: W:  0000000000000000000000000000000000000000 -> 
+  bundle2-output-bundle: "HG20", 1 parts total
+  bundle2-output: start emission of HG20 stream
+  bundle2-output: bundle parameter: 
+  bundle2-output: start of parts
+  bundle2-output: bundle part: "reply:pushkey"
+  bundle2-output-part: "reply:pushkey" (params: 0 advisory) empty payload
+  bundle2-output: part 0: "REPLY:PUSHKEY"
+  bundle2-output: header chunk size: 43
+  bundle2-output: closing payload chunk
+  bundle2-output: end of bundle
+  bundle2-input: start processing of HG20 stream
+  bundle2-input: reading bundle2 stream parameters
+  bundle2-input-bundle: no-transaction
+  bundle2-input: start extraction of bundle2 parts
+  bundle2-input: part header size: 43
+  bundle2-input: part type: "REPLY:PUSHKEY"
+  bundle2-input: part id: "0"
+  bundle2-input: part parameters: 2
+  bundle2-input: found a handler for part reply:pushkey
+  bundle2-input-part: "reply:pushkey" (params: 0 advisory) supported
+  bundle2-input: payload chunk size: 0
+  bundle2-input: part header size: 0
+  bundle2-input: end of bundle2 stream
+  bundle2-input-bundle: 0 parts total
   deleting remote bookmark W
+  listing keys for "phases"
   [1]
 
 export the active bookmark