[encryption] Manage file key by the file to encrypt itself

[acelyc111]

apache/incubator-pegasus#1575

After all encryption related patches been cherry-picked from
tikv and
merged, now we will improve the encrytion, including:

• Fix action job build-linux-encrypted_env-no_compression-no_openssl
  to build binaries without openssl and compression libs correctly.
• Fix action job build-linux-encrypted_env-openssl to export the
  ENCRYPTED_ENV enviroment variable correctly.
• Don not skip tests which are skipped by TiKV.
• Refactor AESCTRCipherStream and AESEncryptionProvider to support
  manage file key by the file itself, according to the design docs in
  Data at rest encryption.
• Remove all KeyManager related codes.
• Replace KeyManager tests by AES encryption tests.
• Refactor encryption/encryption_test.cc and add more tests.
• Make it possible to construct AESEncryptionProvider object via
  EncryptionProvider::CreateFromString() by registering a
  factory in "encryption" library.
  It's possible to construct an object by URI: AES, AES://test or
  AES:<instance_key>,<EncryptionMethod>.
• ldb tool support to parse --fs_uri flags as the URI mentioned above.
• Add tests to create AESEncryptionProvider object in
  CreateEncryptedEnvTest.CreateEncryptedFileSystem
• db_bench support to run benchmark with encryption enabled, by adding
  new flags for db_bench, they are encryption_method and encryption_instance_key.
• Move code from the exported header directory (i.e. include/rocksdb/encryption.h)
  to rocksdb internal (i.e. encryption/encryption.h), do not expose them to users.
• Code format.

Review hint: #17 shows all the code changes
from the base branch (i.e. pegasus-kv:v8.3.2-pegasus), you can review it together to
make sure the request branch acelyc111:pk_enc_new doesn't have vice effect on the base.

Manual test:

// Generate some data.
./db_bench --encryption_method=AES128CTR --encryption_instance_key=test_instance_key  --num=10000

// Dump WAL OK
./tools/ldb --fs_uri="provider=AES; id=EncryptedFileSystem" dump_wal --walfile=/tmp/rocksdbtest-1000/dbbench/000004.log
./tools/ldb --fs_uri="provider=AES://test; id=EncryptedFileSystem" dump_wal --walfile=/tmp/rocksdbtest-1000/dbbench/000004.log
./tools/ldb --fs_uri="provider=AES:test_instance_key,AES128CTR; id=EncryptedFileSystem" dump_wal --walfile=/tmp/rocksdbtest-1000/dbbench/000004.log

// Dump WAL failed. Pass bad provider parameters to --fs_uri, e.g.
./tools/ldb --fs_uri="provider=AES1:test_instance_key,1AES128CTR; id=EncryptedFileSystem" dump_wal --walfile=/tmp/rocksdbtest-1000/dbbench/000004.log
./tools/ldb --fs_uri="provider=AES:bad_test_instance_key,AES128CTR; id=EncryptedFileSystem" dump_wal --walfile=/tmp/rocksdbtest-1000/dbbench/000004.log
./tools/ldb --fs_uri="provider=AES:test_instance_key,AES192CTR; id=EncryptedFileSystem" dump_wal --walfile=/tmp/rocksdbtest-1000/dbbench/000004.log

// The same to other ldb tools.