fix(manager task arguments): Restricted split with maxsplit
fix(manager task arguments): Restricted split with maxsplit

Since some of the arguments of a manager task can contain colon
we have to limit the split to the first occurrence only

Solves https://github.com/scylladb/siren-tests/issues/1005

scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests