Revert "Rename programs to instruction_processors (#3789)" (#3824)

This reverts commit 34344982a9.

programs/failure_program/src/lib.rs

@@ -0,0 +1,14 @@
+use solana_sdk::account::KeyedAccount;
+use solana_sdk::instruction::InstructionError;
+use solana_sdk::pubkey::Pubkey;
+use solana_sdk::solana_entrypoint;
+
+solana_entrypoint!(entrypoint);
+fn entrypoint(
+    _program_id: &Pubkey,
+    _keyed_accounts: &mut [KeyedAccount],
+    _data: &[u8],
+    _tick_height: u64,
+) -> Result<(), InstructionError> {
+    Err(InstructionError::GenericError)
+}