Revert "Migrating prereqs.sh to ansible playbook"

This reverts commit 375d5a991c2cdea67f5388648f2f18bc13db2f44.
Revert "Revert "Migrating prereqs.sh to ansible playbook""

This reverts commit 4e1f6662e1ea9113208e3c2abba17a2f6937157f.