bzr fast-export of update-manager to git fast-import fails

[Benjamin Drung]

Converting update-manager from bzr to git fails (on Ubuntu 22.04 and 22.10):

```
bzr branch lp:~ubuntu-core-dev/update-manager/main update-manager
mkdir update-manager.git
cd update-manager.git
git init --initial-branch=master
bzr fast-export --plain ../update-manager | git fast-import
```

Log output:

```
13:26:42 Calculating the revisions to include ...
13:26:42 Starting export of 4392 revisions ...
13:26:42 1000/4392 commits exported at 175211/minute
13:26:42 1000/4392 commits exported at 170185/minute
13:26:43 1000/4392 commits exported at 147485/minute
13:26:43 1000/4392 commits exported at 141297/minute
13:26:43 1000/4392 commits exported at 140854/minute
13:26:43 1000/4392 commits exported at 140695/minute
13:26:43 1000/4392 commits exported at 125106/minute
13:26:43 1000/4392 commits exported at 123494/minute
fatal: Path UpdateManagerCommon/Makefile not in branch
fast-import: dumping crash report to .git/fast_import_crash_213962
brz: broken pipe
```

[Benjamin Drung (bdrung)]

This is a bug in bzr fast-export. "bzr log -v -r2" shows that Common/ is renamed to UpdateManagerCommon/:

```
$ bzr log -v -r2
------------------------------------------------------------
revno: 2
committer: Michael Vogt <egon@top>
timestamp: Tue 2005-11-15 15:08:26 +0100
message:
  * switched to python dist-utils (DIE auto* DIE)
  * works with channels now (for adding)
removed:
  configure
  install-sh
  intltool-extract
  intltool-extract.in
  intltool-merge
  intltool-merge.in
  intltool-update
  omf.make
  xmldocs.make
added:
  UpdateManagerCommon/__init__.py
  setup.py
renamed:
  Common/ => UpdateManagerCommon/
  SoftwareProperties/SoftwareProperties.py.in => SoftwareProperties/SoftwareProperties.py
  distribution-data/ => channels/
  src/update-manager.in => src/update-manager
modified:
  Common/DistInfo.py
  SoftwareProperties/aptsources.py
  SoftwareProperties/dialog_add.py
  SoftwareProperties/SoftwareProperties.py
  src/update-manager
```

But the output of "bzr fast-export --plain" does not contain this rename:

```
[...]
mark :2
committer Michael Vogt <egon@top> 1132063706 +0100
data 87
* switched to python dist-utils (DIE auto* DIE)
* works with channels now (for adding)

from :1
R SoftwareProperties/SoftwareProperties.py.in SoftwareProperties/SoftwareProperties.py
R src/update-manager.in src/update-manager
D configure
D install-sh
D intltool-extract
D intltool-extract.in
D intltool-merge
D intltool-merge.in
D intltool-update
D omf.make
D xmldocs.make
M 644 inline UpdateManagerCommon/DistInfo.py
data 3654
[...]
```

[Benjamin Drung (bdrung)]

Tested also brz 3.3.0+bzr7661-2 in a Debian unstable chroot. Same result.