lwm2m: fix bugs in PR commits

common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/bootstrap/LwM2MTransportBootstrapService.java

@@ -72,7 +72,7 @@ public class LwM2MTransportBootstrapService {
             server.destroy();
             log.info("LwM2M transport bootstrap server stopped!");
         } catch (Exception e) {
-            log.error("", e);
+            log.error("Failed to gracefully stop the LwM2M transport bootstrap server!", e);
         }
     }
 
@@ -122,7 +122,7 @@ public class LwM2MTransportBootstrapService {
         } else {
             /* by default trust all */
             builder.setTrustedCertificates(new X509Certificate[0]);
-            log.info("Unable to load X509 files for BootStrapServer");
+            log.info("Unable to load X509 files for BootStrap Server");
             dtlsConfig.setAsList(DtlsConfig.DTLS_CIPHER_SUITES, PSK_CIPHER_SUITES);
         }
     }

common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/bootstrap/store/LwM2MBootstrapConfigStoreTaskProvider.java

@@ -178,7 +178,7 @@ public class LwM2MBootstrapConfigStoreTaskProvider implements BootstrapTaskProvi
                 serverInstances.put(shortId, instance.getId());
             });
         } catch (Exception e) {
-            log.error("", e);
+            log.error("Failed find Server Instance Id. ", e);
         }
         if (this.securityInstances != null && this.securityInstances.size() > 0 && this.serverInstances != null && this.serverInstances.size() > 0) {
             this.findBootstrapServerId();

common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/server/DefaultLwM2mTransportService.java

@@ -104,7 +104,7 @@ public class DefaultLwM2mTransportService implements LwM2MTransportService {
             server.destroy();
             log.info("LwM2M transport server stopped!");
         } catch (Exception e) {
-            log.error("", e);
+            log.error("Failed to gracefully stop the LwM2M transport server!", e);
         }
     }