Picture this: It’s a Saturday night at Yoshi’s, a restaurant and nightclub in Oakland. You see folks strutting in, decked out in suits with wide lapels and jewel-tone dresses that glimmer like distant stars. Draped in bangles, clutching canes, full-brim hats angled just right. They’ve come to see ConFunkShun, the R&B group known for fusing funk and soul and pouring out heart-oozing hits like “Love’s Train” and “Straight From the Heart” and “By Y…