syz-gce: fix manager config generation
syz-gce: fix manager config generation

gcs_path is now a mandatory parameter.

xairy/syzkaller,dotweiba/syzkaller,google/syzkaller,hyz0906/syzkaller,xairy/syzkaller,xairy/syzkaller,zoulasc/syzkaller,dotweiba/syzkaller,hyz0906/syzkaller,hyz0906/syzkaller,zoulasc/syzkaller,xairy/syzkaller,google/syzkaller,xairy/syzkaller,zoulasc/syzkaller,hyz0906/syzkaller,zoulasc/syzkaller,google/syzkaller,hyz0906/syzkaller,google/syzkaller,dotweiba/syzkaller,google/syzkaller,dotweiba/syzkaller,xairy/syzkaller,google/syzkaller,google/syzkaller,xairy/syzkaller