bundle2: introduce a specific function for bundling debug message
The bundling process is very verbose, we would like to be able to hide such
output behind a configuration flag and have it more explicitly referencing
bundle2. The first step is to gather all these messages in a dedicated
function.
The same gathering will be later do for debug message issue by unbundling.
$ hg init
$ echo a > a
$ hg ci -qAm 'add a'
$ hg init subrepo
$ echo 'subrepo = http://example.net/libfoo' > .hgsub
$ hg ci -qAm 'added subrepo'
$ hg up -qC 0
$ echo ax > a
$ hg ci -m 'changed a'
created new head
$ hg up -qC 1
$ cd subrepo
$ echo b > b
$ hg add b
$ cd ..
Should fail, since there are added files to subrepo:
$ hg merge
abort: uncommitted changes in subrepository 'subrepo'
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