test: use `printenv.py --line` in `test-bundle.t`

This makes the output easier to update and read.

tests/test-bundle.t

@@ -218,7 +218,7 b' Pull ../full.hg into empty (with hook)'
 
   $ cat >> .hg/hgrc <<EOF
   > [hooks]
-  > changegroup = sh -c "printenv.py changegroup"
+  > changegroup = sh -c "printenv.py --line changegroup"
   > EOF
 
 doesn't work (yet ?)
@@ -233,7 +233,14 b' hg -R bundle://../full.hg verify'
   adding file changes
   added 9 changesets with 7 changes to 4 files (+1 heads)
   new changesets f9ee2f85a263:aa35859c02ea (9 drafts)
-  changegroup hook: HG_HOOKNAME=changegroup HG_HOOKTYPE=changegroup HG_NODE=f9ee2f85a263049e9ae6d37a0e67e96194ffb735 HG_NODE_LAST=aa35859c02ea8bd48da5da68cd2740ac71afcbaf HG_SOURCE=pull HG_TXNID=TXN:$ID$ HG_URL=bundle*../full.hg (glob)
+  changegroup hook: HG_HOOKNAME=changegroup
+  HG_HOOKTYPE=changegroup
+  HG_NODE=f9ee2f85a263049e9ae6d37a0e67e96194ffb735
+  HG_NODE_LAST=aa35859c02ea8bd48da5da68cd2740ac71afcbaf
+  HG_SOURCE=pull
+  HG_TXNID=TXN:$ID$
+  HG_URL=bundle:../full.hg
+  
   (run 'hg heads' to see heads, 'hg merge' to merge)
 
 Rollback empty
@@ -257,7 +264,14 b' Pull full.hg into empty again (using -R;'
   adding file changes
   added 9 changesets with 7 changes to 4 files (+1 heads)
   new changesets f9ee2f85a263:aa35859c02ea (9 drafts)
-  changegroup hook: HG_HOOKNAME=changegroup HG_HOOKTYPE=changegroup HG_NODE=f9ee2f85a263049e9ae6d37a0e67e96194ffb735 HG_NODE_LAST=aa35859c02ea8bd48da5da68cd2740ac71afcbaf HG_SOURCE=pull HG_TXNID=TXN:$ID$ HG_URL=bundle:empty+full.hg
+  changegroup hook: HG_HOOKNAME=changegroup
+  HG_HOOKTYPE=changegroup
+  HG_NODE=f9ee2f85a263049e9ae6d37a0e67e96194ffb735
+  HG_NODE_LAST=aa35859c02ea8bd48da5da68cd2740ac71afcbaf
+  HG_SOURCE=pull
+  HG_TXNID=TXN:$ID$
+  HG_URL=bundle:empty+full.hg
+  
   (run 'hg heads' to see heads, 'hg merge' to merge)
 
 #endif