[CryptoLogic] Fix func name and set max schema version

[CryptoLogic] Fix func name and set max schema version

Change function name: CLEAR_FLAG => CLEAR_FLAGS

Define maximum variable of schema version available.
To changing encryption schema bitmask from int to std::bitset
makes some backward compatability issue because it resides in
DB::Row::encryptionScheme as int already which is in DB.
But std::bitset cannot support converting to int (only ulong & ulong
long) so it's hard to use.

Change-Id: Ia27ec252f67c61fece9b34b1458724476b653b77
Signed-off-by: Kyungwook Tak <k.tak@samsung.com>