Enhance manifest_dump to print each individual edit.

Summary:
The manifest file contains a series of edits. If the verbose
option is switched on, then print each individual edit in the
manifest file. This helps in debugging.

Test Plan: make clean manifest_dump

Reviewers: emayanke, sheki

Reviewed By: sheki

CC: leveldb

Differential Revision: https://reviews.facebook.net/D6807

tools/manifest_dump.cc

@@ -60,7 +60,7 @@ int main(int argc, char** argv) {
 
   VersionSet* versions = new VersionSet(dbname, &options,
                                    tc, cmp);
-  Status s = versions->DumpManifest(options, file);
+  Status s = versions->DumpManifest(options, file, verbose);
   if (!s.ok()) {
     printf("Error in processing file %s %s\n", manifestfile.c_str(),
            s.ToString().c_str());