f522fb7c9 tests: Remove unused mininode functions deser_int_vector(f) and ser_int_vector(l) (practicalswift)
Pull request description:
* Remove unused mininode functions `deser_int_vector(f)` and `ser_int_vector(l)`. Last use removed in 3858aabbd084b2cc4534c40a178bbcc22fb82968. Friendly ping @jnewbery :-)
* Remove unused imports.
Tree-SHA512: 840c5623eae9f929561f6e86816883c5904ec1af82fc8d5e56dee1c0b1fe22e8600c10f7358ed8b556b3aec8c65c4910f6eee30e8015a573c4df8bef91124d3e
Backport of Core PR11683
https://github.com/bitcoin/bitcoin/pull/11683/commits/0f3b752ec78e53099af0277d15fc2bf8e0c92d05
This PR actually had two commits, but the second commit (`0f3b752ec Remove unused imports (practicalswift)`) was blank after fixing merge conflicts.