Correct rewrite_terraform_examples versioning logic.
Correct rewrite_terraform_examples versioning logic.

  + Use `git describe` following bump commit to re-calculate example ref.

[#87262154]

Signed-off-by: David Wadden <ff4ebafbe4a7d77cde45f9afefafd7a5dfa94f36@pivotal.io>

SrinivasChilveri/lattice,mikegehard/lattice,svrc-pivotal/lattice,cloudfoundry-incubator/ltc,davidwadden/lattice,Klaudit/lattice,Klaudit/lattice,datachand/lattice,svrc-pivotal/lattice,svrc-pivotal/lattice,Klaudit/lattice,datachand/lattice,SrinivasChilveri/lattice,datachand/lattice,SrinivasChilveri/lattice,davidwadden/lattice-release,Klaudit/lattice,datachand/lattice,davidwadden/lattice,SrinivasChilveri/lattice,cloudfoundry-incubator/ltc,felipeg48/lattice,felipeg48/lattice,svrc-pivotal/lattice,davidwadden/lattice-release,mikegehard/lattice