thrift: convert sprint() to format()
thrift: convert sprint() to format()

sprint() recently became more strict, throwing on sprint("%s", 5). Replace
with the more modern format().

Mechanically converted with https://github.com/avikivity/unsprint.

scylladb/scylla,scylladb/scylla,scylladb/scylla,avikivity/scylla,avikivity/scylla,avikivity/scylla,scylladb/scylla