Merge bitcoin#11683: tests: Remove unused mininode functions {ser,des…

…er}_int_vector(...). Remove unused imports.

f522fb7 tests: Remove unused mininode functions deser_int_vector(f) and ser_int_vector(l) (practicalswift)
0f3b752 Remove unused imports (practicalswift)

Pull request description:

  * Remove unused mininode functions `deser_int_vector(f)` and `ser_int_vector(l)`. Last use removed in 3858aab. Friendly ping @jnewbery :-)
  * Remove unused imports.

Tree-SHA512: 840c5623eae9f929561f6e86816883c5904ec1af82fc8d5e56dee1c0b1fe22e8600c10f7358ed8b556b3aec8c65c4910f6eee30e8015a573c4df8bef91124d3e

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