Added Update method to report on dbus

- Update method, updates timestamp and readings

Tested:
  - Added new unit tests covering update method
  - All existing unit tests are passing

Change-Id: I6b3829126d9060dbaf436cbf8e6917294dc03134
Signed-off-by: Krzysztof Grobelny <krzysztof.grobelny@intel.com>
diff --git a/tests/src/dbus_environment.cpp b/tests/src/dbus_environment.cpp
index ab749db..71568f9 100644
--- a/tests/src/dbus_environment.cpp
+++ b/tests/src/dbus_environment.cpp
@@ -73,7 +73,7 @@
 bool DbusEnvironment::waitForFuture(std::string_view name,
                                     std::chrono::milliseconds timeout)
 {
-    return waitForFuture(getFuture(name), timeout).value_or(false);
+    return waitForFuture(getFuture(name), timeout);
 }
 
 std::future<bool> DbusEnvironment::getFuture(std::string_view name)