openSUSE / agama / 9169739175

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fix: Emit signal when storage propeties change (#1236)

### Problem

The value of the D-Bus properties *ProductMountPoints* and
*EncryptionMethods* from the interface
*org.opensuse.Agama.Storage1.Proposal.Calculator* depend on the selected
product. Nevertheless, the *PropertiesChanged* signal is not emitted
when the product changes. Therefore, proxies clients never update such
values.

This implies that the option for FDE (Full Disk Encryption) might not be
shown. See https://github.com/openSUSE/agama/pull/1004.

### Solution

* For the *ProductMountPoints* property: emit a *PropertiesChanged*
signal when the product changes.
* For the *EncryptionMethods* property: emit a *PropertiesChaged* signal
when software is probed. Note that the availability of certain packages
is checked in order to know whether FDE is a possible encryption method.

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