exception: switch to public sdbus exception

SdBusError was intended to be a private error type inside sdbusplus.
Switch all catch locations to use the general sdbusplus::exception type.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I69bd31eba7b09cf49a3a2cdce94c978b1ce3fa4d
diff --git a/src/system_configuration.cpp b/src/system_configuration.cpp
index 4fbf601..6c30da2 100644
--- a/src/system_configuration.cpp
+++ b/src/system_configuration.cpp
@@ -96,7 +96,7 @@
         reply.read(name);
         return std::get<std::string>(name);
     }
-    catch (const sdbusplus::exception::SdBusError& ex)
+    catch (const sdbusplus::exception::exception& ex)
     {
         log<level::ERR>(
             "Failed to get the hostname from systemd-hostnamed service",