Bump BOSH director to 255.10 and aws-cpi to 51
Bump BOSH director to 255.10 and aws-cpi to 51

[#118207271]

Signed-off-by: Adrian Zankich <06c4bdd5da019c5d30546d0230d625621ed622b0@pivotal.io>

cloudfoundry/mega-ci,cloudfoundry/mega-ci