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

This reverts commit 34344982a9.

programs/noop_program/src/lib.rs

@@ -0,0 +1,20 @@
+use log::*;
+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> {
+    solana_logger::setup();
+    info!("noop: program_id: {:?}", program_id);
+    info!("noop: keyed_accounts: {:#?}", keyed_accounts);
+    info!("noop: data: {:?}", data);
+    info!("noop: tick_height: {:?}", tick_height);
+    Ok(())
+}