Merge remote-tracking branch 'publication/2.3.1-rc' into HEAD

MAGETWO-97699: Magento 2.2.8 Publication

 (build 2.2.8.025)

MAGETWO-97695: Magento 2.1.17 Publication

 (build 2.1.17.008)

Updated deprecation doc annotations

MAGETWO-95168: Magento 2.2.7 Publication

 (build 2.2.7.019)

MAGETWO-95579: Magento 2.1.16 Publication

 (build 2.1.16.005)

MAGETWO-94054: Magento 2.1.15 Publication

 (build 2.1.15.008)

MAGETWO-93191: Magento 2.2.6 Publication

 (build 2.2.6.023)

MAGETWO-90541: Magento 2.2.5 Publication

 (build 2.2.5.025)

MAGETWO-90394: Magento 2.1.14 Publication

 (build 2.1.14.013)