Scan files at startup for Auditbeat file integrity module (elastic#5344)

At startup the file integrity module will iterate over directories and their contents and send events if any changes have occured since the last time Auditbeat was running. State information is persisted to {path.data}. Scanning at startup is enabled by default.

Closes elastic#5167

.gitignore

@@ -15,6 +15,7 @@
 *.generated.yml
 coverage.out
 .python-version
+beat.db
 
 # Editor swap files
 *.swp

NOTICE.txt

@@ -115,6 +115,34 @@ COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
+--------------------------------------------------------------------
+Dependency: github.com/boltdb/bolt
+Version: v1.3.1
+Revision: 2f1ce7a837dcb8da3ec595b1dac9d0632f0f99e8
+License type (autodetected): MIT license
+./vendor/github.com/boltdb/bolt/LICENSE:
+--------------------------------------------------------------------
+The MIT License (MIT)
+
+Copyright (c) 2013 Ben Johnson
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
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+
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+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
 --------------------------------------------------------------------
 Dependency: github.com/davecgh/go-spew
 Revision: 5215b55f46b2b919f50a1df0eaa5886afe4e3b3d
@@ -1095,6 +1123,15 @@ THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+--------------------------------------------------------------------
+Dependency: github.com/google/flatbuffers
+Revision: 7a6b2bf521e95097a92ec848001531b2dcf0f3fa
+License type (autodetected): Apache License 2.0
+./vendor/github.com/google/flatbuffers/LICENSE.txt:
+--------------------------------------------------------------------
+Apache License 2.0
+
+
 --------------------------------------------------------------------
 Dependency: github.com/google/uuid
 Revision: 6a5e28554805e78ea6141142aba763936c4761c0
@@ -1536,6 +1573,204 @@ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 
+--------------------------------------------------------------------
+Dependency: github.com/juju/ratelimit
+Revision: 5b9ff866471762aa2ab2dced63c9fb6f53921342
+License type (autodetected): Unknown
+./vendor/github.com/juju/ratelimit/LICENSE:
+--------------------------------------------------------------------
+All files in this repository are licensed as follows. If you contribute
+to this repository, it is assumed that you license your contribution
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+                   GNU LESSER GENERAL PUBLIC LICENSE
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 --------------------------------------------------------------------
 Dependency: github.com/klauspost/compress
 Revision: 14c9a76e3c95e47f8ccce949bba2c1101a8b85e6

auditbeat/auditbeat.reference.yml

@@ -56,7 +56,15 @@ auditbeat.modules:
   - /usr/sbin
   - /etc
 
-  # Limit on the size of files that will be hashed. Default is 100 MiB.
+  # Scan over the configured file paths at startup and send events for new or
+  # modified files since the last time Auditbeat was running.
+  file.scan_at_start: true
+
+  # Average scan rate. This throttles the amount of CPU and I/O that Auditbeat
+  # consumes at startup while scanning. Default is "50 MiB".
+  file.scan_rate_per_sec: 50 MiB
+
+  # Limit on the size of files that will be hashed. Default is "100 MiB".
   file.max_file_size: 100 MiB
 
   # Hash types to compute when the file changes. Supported types are md5, sha1,