Added cloudwatch log group data source#4167

Merged

bflad merged 3 commits intohashicorp:masterfrom sjauld:f/data-source-cloudwatch-log-group

Apr 12, 2018

+138

Commits on Apr 11, 2018

added cloudwatch log group data source (hashicorp#3247 )
Stuart Auld
committed
cloudwatch log group documentation
Stuart Auld
committed
PR feedback
Stuart Auld
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