Add a constructor to generate random pubkeys

drone/src/drone.rs

@@ -339,7 +339,7 @@ mod tests {
 
     #[test]
     fn test_drone_build_airdrop_transaction() {
-        let to = Keypair::new().pubkey();
+        let to = Pubkey::new_rand();
         let blockhash = Hash::default();
         let request = DroneRequest::GetAirdrop {
             lamports: 2,
@@ -377,7 +377,7 @@ mod tests {
 
     #[test]
     fn test_process_drone_request() {
-        let to = Keypair::new().pubkey();
+        let to = Pubkey::new_rand();
         let blockhash = Hash::new(&to.as_ref());
         let lamports = 50;
         let req = DroneRequest::GetAirdrop {