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: Ifa2391f2f582cb2cf16dc85012a05e1f4f6659fd
diff --git a/systemd_target_signal.cpp b/systemd_target_signal.cpp
index 7d1d1db..032722b 100644
--- a/systemd_target_signal.cpp
+++ b/systemd_target_signal.cpp
@@ -35,7 +35,7 @@
     {
         this->bus.call_noreply(method);
     }
-    catch (const sdbusplus::exception::SdBusError& e)
+    catch (const sdbusplus::exception::exception& e)
     {
         log<level::ERR>("Failed to create systemd target error",
                         entry("ERROR=%s", error.c_str()),
@@ -115,7 +115,7 @@
     {
         this->bus.call(method);
     }
-    catch (const sdbusplus::exception::SdBusError& e)
+    catch (const sdbusplus::exception::exception& e)
     {
         // If error indicates systemd is not on dbus yet then do nothing.
         // The systemdNameChangeSignals callback will detect when it is on