os/ceph-bluestore-tool: unify output for bluefs-bdev-expand command.

This commit is specific for pre-Nautilius releases (mimic & luminous)
as we don't backport main device expansion feature. Which
makes this mimic/luminous commit completely different from nautilus one.

Signed-off-by: Igor Fedotov <ifedotov@suse.com>
(cherry picked from commit c098f5f)

src/os/bluestore/bluestore_tool.cc

@@ -477,15 +477,15 @@ int main(int argc, char **argv)
   }
   else if (action == "bluefs-bdev-expand") {
     BlueFS *fs = open_bluefs(cct.get(), path, devs);
-    cout << "start:" << std::endl;
     fs->dump_block_extents(cout);
+    cout << "Expanding..." << std::endl;
     for (int devid : { BlueFS::BDEV_WAL, BlueFS::BDEV_DB }) {
       if (!fs->is_device(devid)) {
         continue;
       }
       if (!fs->is_device_expandable(devid)) {
 	cout << devid
-	     << " : can't be expanded."
+	     << " : can't be expanded. Bypassing..."
 	     << std::endl;
 	continue;
       }
@@ -495,12 +495,14 @@ int main(int argc, char **argv)
       uint64_t end = before.range_end();
       uint64_t size = fs->get_block_device_size(devid);
       if (end < size) {
-	cout << "expanding dev " << devid << " from 0x" << std::hex
+	cout << devid
+	     <<" : expanding " << " from 0x" << std::hex
 	     << end << " to 0x" << size << std::dec << std::endl;
 	fs->add_block_extent(devid, end, size-end);
 	const char* path = find_device_path(devid, cct.get(), devs);
 	if (path == nullptr) {
-	  cerr << "Can't find device path for dev " << devid << std::endl;
+	  cerr << devid
+	       <<": can't find device path " << std::endl;
 	  continue;
 	}
 	bluestore_bdev_label_t label;
@@ -517,8 +519,9 @@ int main(int argc, char **argv)
 		<< cpp_strerror(r) << std::endl;
 	  continue;
 	}
-	cout << "dev " << devid << " size label updated to "
-	      << size << std::endl;
+	cout << devid
+	     <<" : size label updated to " << size
+	     << std::endl;
       }
     }
     delete fs;