Prashant D 7b57510a17 utilities: Fix coverity issues in blob_db and col_buf_decoder
Summary:
utilities/blob_db/blob_db_impl.cc
265                    : bdb_options_.blob_dir;
   	3. uninit_member: Non-static class member env_ is not initialized in this constructor nor in any functions that it calls.
   	5. uninit_member: Non-static class member ttl_extractor_ is not initialized in this constructor nor in any functions that it calls.
   	7. uninit_member: Non-static class member open_p1_done_ is not initialized in this constructor nor in any functions that it calls.

CID 1418245 (#1 of 1): Uninitialized pointer field (UNINIT_CTOR)
9. uninit_member: Non-static class member debug_level_ is not initialized in this constructor nor in any functions that it calls.
266}

   	4. past_the_end: Function end creates an iterator.

CID 1418258 (#1 of 1): Using invalid iterator (INVALIDATE_ITERATOR)
5. deref_iterator: Dereferencing iterator file_nums.end() though it is already past the end of its container.

utilities/col_buf_decoder.h:
     nullable_(nullable),
   	2. uninit_member: Non-static class member remain_runs_ is not initialized in this constructor nor in any functions that it calls.
   	4. uninit_member: Non-static class member run_val_ is not initialized in this constructor nor in any functions that it calls.

CID 1396134 (#1 of 1): Uninitialized scalar field (UNINIT_CTOR)
6. uninit_member: Non-static class member last_val_ is not initialized in this constructor nor in any functions that it calls.
 46        big_endian_(big_endian) {}
Closes https://github.com/facebook/rocksdb/pull/3134

Differential Revision: D6340607

Pulled By: sagar0

fbshipit-source-id: 25c52566e2ff979fe6c7abb0f40c27fc16597054
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