Icemac.install.addressbook

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- Nothing changed yet.

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- Pin dependencies to older versions to keep supporting Python 2.

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- When already using an address book version with an encrypted admin password
and then omitting the password when updating to the next version the
`admin.zcml` file from the previous installation is copied. (This was not
the case before leading to a broken installation because of a missing
`admin.zcml`.)

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- Add install dependency for `zc.lockfile` because it cannot be loaded in the
buildout environment when `zc.buildout` is installed via `pip`.

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- Remove entries in crontab generated by the previous address book version
when updating to a new one.

- Move whole installation code here from `icemac.addressbook` supporting its
versions >= 9.

- Add script `bin/change-addressbook-config` to change configuration without
installing a new addressbook version.

- Hash the admin password in the created `admin.zcml` and force to change the
plain text password during install resp. config update.

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- Use virtualenv instead of `bootstrap.py` of `zc.buildout`.