Revert "[CALCITE-3090] Use https for maven central"
Revert "[CALCITE-3090] Use https for maven central"

This reverts commit 13102955bf0e1d6619593c5ef6fd0ef52a1be58d.

apache/calcite,xhoong/incubator-calcite,jcamachor/calcite,xhoong/incubator-calcite,datametica/calcite,googleinterns/calcite,vlsi/calcite,googleinterns/calcite,julianhyde/calcite,vlsi/incubator-calcite,jcamachor/calcite,jcamachor/calcite,googleinterns/calcite,datametica/calcite,looker-open-source/calcite,looker-open-source/calcite,julianhyde/calcite,vlsi/calcite,apache/calcite,vlsi/incubator-calcite,xhoong/incubator-calcite,apache/calcite,jcamachor/calcite,apache/calcite,vlsi/calcite,datametica/calcite,datametica/calcite,julianhyde/calcite,googleinterns/calcite,datametica/calcite,vlsi/calcite,julianhyde/calcite,looker-open-source/calcite,looker-open-source/calcite,xhoong/incubator-calcite,googleinterns/calcite,jcamachor/calcite,vlsi/calcite,apache/calcite,datametica/calcite,googleinterns/calcite,looker-open-source/calcite,julianhyde/calcite,julianhyde/calcite,looker-open-source/calcite,apache/calcite,vlsi/calcite,jcamachor/calcite