Dbid feature

Summary:
Create a new type of file on startup if it doesn't already exist called DBID.
This will store a unique number generated from boost library's uuid header file.
The use-case is to identify the case of a db losing all its data and coming back up either empty or from an image(backup/live replica's recovery)
the key point to note is that DBID is not stored in a backup or db snapshot
It's preferable to use Boost for uuid because:
1) A non-standard way of generating uuid is not good
2) /proc/sys/kernel/random/uuid generates a uuid but only on linux environments and the solution would not be clean
3) c++ doesn't have any direct way to get a uuid
4) Boost is a very good library that was already having linkage in rocksdb from third-party
Note: I had to update the TOOLCHAIN_REV in build files to get latest verison of boost from third-party as the older version had a bug.
I had to put Wno-uninitialized in Makefile because boost-1.51 has an unitialized variable and rocksdb would not comiple otherwise. Latet open-source for boost is 1.54 but is not there in third-party. I have notified the concerned people in fbcode about it.
@kailiu : While releasing to third-party, an additional dependency will need to be created for boost in TARGETS file. I can help identify.

Test Plan:
Expand db_test to test 2 cases
1) Restarting db with Id file present - verify that no change to Id
2)Restarting db with Id file deleted - verify that a different Id is there after reopen
Also run make all check

Reviewers: dhruba, haobo, kailiu, sdong

Reviewed By: dhruba

CC: leveldb

Differential Revision: https://reviews.facebook.net/D13587

db/db_impl.cc

@@ -509,6 +509,7 @@ void DBImpl::PurgeObsoleteFiles(DeletionState& state) {
           break;
         case kCurrentFile:
         case kDBLockFile:
+        case kIdentityFile:
         case kMetaDatabase:
           keep = true;
           break;
@@ -639,6 +640,13 @@ Status DBImpl::Recover(VersionEdit* edit, MemTable* external_table,
             dbname_, "exists (error_if_exists is true)");
       }
     }
+    // Check for the IDENTITY file and create it if not there
+    if (!env_->FileExists(IdentityFileName(dbname_))) {
+      s = SetIdentityFile(env_, dbname_);
+      if (!s.ok()) {
+        return s;
+      }
+    }
   }
 
   Status s = versions_->Recover();