Mfoniso Udofia’s play “Sojourners” is the first in a series of nine plays that make up the Ufot Family Cycle. The plays are based on the real-life experiences of Nigerian-American immigrants and spans three generations. “Sojourners,” which starts at the end of October at the Huntington Theatre, kicks off a two-year presentation of all the plays in a unique city-wide and Greater Boston festival – the first time all nine plays have ever been performed as a cycle. Udofia tells us the inspiration behind her work and how it feels to finally have her vision made reality.