aserver: constructor to initialize properties

Functions like 'emit_added()' do not work correctly if properties are
not initialized. Often, the initial values for the properties of an
interface are

aserver: constructor to initialize properties

Functions like 'emit_added()' do not work correctly if properties are
not initialized. Often, the initial values for the properties of an
interface are known, such as

- Software Version Interface
- Software ActivationProgress Interface
- Software ApplyTime Interface
- ...

How was this previously handled?

- Write a wrapper class for the specific aserver class.
This allows to initialize the properties, as they are protected
members. Example [2]

- Write a wrapper class and provide methods to get/set the variables.
This is done in [1]

- Set each property with a method call, which emits
'PropertyChanged' signal by default, not ideal.
This also does not work if the interface is ever refactored to have
additional properties.

To facilitate using these interfaces without having to write a wrapper
class to inherit from them, and to avoid having to manually set each
property, which can easily be forgotten, provide a constructor to
allow for passing a struct with values for all the properties.

Tested: Unit tests pass, but still needs to be build-tested against
openbmc/openbmc. The concern there is mostly due to an added template
parameter.

References:
[1] https://github.com/openbmc/sdbusplus/blob/da8574d5888b2c1622f5482a47adc7a12ffa0d0e/example/calculator-aserver.cpp#L44
[2] https://github.com/openbmc/phosphor-bmc-code-mgmt/blob/4983b138ea8fc70bd66fe4d30500e6252629fa5d/common/src/software.cpp#L29

Change-Id: I873cbca97ae16b19bfbf622303f4d52e2563a62c
Signed-off-by: Alexander Hansen <alexander.hansen@9elements.com>
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>

show more ...