Fix a concurrent map write panic in auditd module (#8158) (#8161)

Update github.com/elastic/go-libaudit to v0.4.0, which includes the fix
for this issue.

(cherry picked from commit 448eeb2)

CHANGELOG.asciidoc

@@ -45,6 +45,7 @@ https://github.com/elastic/beats/compare/v6.4.0...6.x[Check the HEAD diff]
 
 - Fixed a crash in the file_integrity module under Linux. {issue}7753[7753]
 - Fixed the RPM by designating the config file as configuration data in the RPM spec. {issue}8075[8075]
+- Fixed a concurrent map write panic in the auditd module. {pull}8158[8158]
 
 *Filebeat*
 

NOTICE.txt

@@ -401,7 +401,8 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 --------------------------------------------------------------------
 Dependency: github.com/elastic/go-libaudit
-Revision: ec7a7253716958d85ea854cbef4aaffcd6cbd50b
+Version: v0.4.0
+Revision: 39073a2988f718067d85d27a4d18b1b57de5d947
 License type (autodetected): Apache-2.0
 ./vendor/github.com/elastic/go-libaudit/LICENSE.txt:
 --------------------------------------------------------------------

vendor/vendor.json

@@ -379,34 +379,44 @@
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 		},
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-			"revision": "ec7a7253716958d85ea854cbef4aaffcd6cbd50b",
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+			"revision": "39073a2988f718067d85d27a4d18b1b57de5d947",
+			"revisionTime": "2018-08-29T20:25:13Z",
+			"version": "v0.4.0",
+			"versionExact": "v0.4.0"
 		},
 		{
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+			"revision": "39073a2988f718067d85d27a4d18b1b57de5d947",
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+			"version": "v0.4.0",
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 		{
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 		{
 			"checksumSHA1": "zGv2vPwSLoFCRt1kcD81pBzTo+0=",
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+			"revision": "39073a2988f718067d85d27a4d18b1b57de5d947",
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 			"path": "github.com/elastic/go-libaudit/rule/flags",
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-			"revisionTime": "2018-08-07T15:01:12Z"
+			"revision": "39073a2988f718067d85d27a4d18b1b57de5d947",
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