Set logp default for keepfiles to 7

The config files and docs state that the default number of backups to keep is 7. This default value in the code was lost during the logging refactor. Fixes elastic#7494 (cherry picked from commit 94fe58a)
andrewkroh · Jul 3, 2018 · 0388666 · 0388666
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diff --git a/CHANGELOG.asciidoc b/CHANGELOG.asciidoc
@@ -29,6 +29,9 @@ https://github.com/elastic/beats/compare/v6.3.0...6.3[Check the HEAD diff]
 
 *Affecting all Beats*
 
+- Fix default value for logging.files.keepfiles. It was being set to 0 and now
+  it's set to the documented value of 7. {issue}7494[7494]
+
 *Auditbeat*
 
 *Filebeat*

diff --git a/libbeat/logp/config.go b/libbeat/logp/config.go
@@ -35,6 +35,7 @@ var defaultConfig = Config{
 	ToFiles: true,
 	Files: FileConfig{
 		MaxSize:     10 * 1024 * 1024,
+		MaxBackups:  7,
 		Permissions: 0600,
 	},
 	addCaller: true,