(maint) Update changelog and metadata for 1.7.3 release#59

Magisus merged 1 commit into1.7.3-releasepuppetlabs/puppetlabs-cd4pe_jobs:1.7.3-releasefrom

release-prep-1.7.3puppetlabs/puppetlabs-cd4pe_jobs:release-prep-1.7.3Copy head branch name to clipboard