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e687120d96
Since change 635ac7 we try to install Dovecot, even if it is already
running, which fails Dovecot upgrades fail when the installed version
differs from the target because dovecot-imapd/lmtpd dependencies
on dovecot-core: packages are installed one at a time via apt.deb(),
i.e. `dpkg -i`, and dpkg cannot satisfy them dependencies:
```
dpkg: dependency problems prevent configuration of dovecot-imapd:
dovecot-imapd depends on dovecot-core (= 1:2.3.21+dfsg1-3); however:
Version of dovecot-core on system is 1:2.3.21.1+dfsg1-1~bpo12+1.
```
Split _install_dovecot_package into _download_dovecot_package (download
only, return path) and a single server.shell call that passes all .deb
files to dpkg -i together. Uses the same 3-step pattern as pyinfra's
apt.deb: tolerant first dpkg -i, apt-get --fix-broken, then final
dpkg -i to fail if there are still errors.