Greatly reduce the metrics vmstat returns by default.

Vmstat has over 100 fields, most of which are highly
detailed debug information. Trim this down to only
essential fields by default, configurable by flag.

Signed-off-by: Brian Brazil <brian.brazil@robustperception.io>

end-to-end-test.sh

@@ -32,6 +32,7 @@ enabled_collectors=$(cat << COLLECTORS
   stat
   textfile
   bonding
+  vmstat
   wifi
   xfs
   zfs
@@ -42,7 +43,6 @@ disabled_collectors=$(cat << COLLECTORS
   time
   timex
   uname
-  vmstat
 COLLECTORS
 )
 cd "$(dirname $0)"
@@ -148,4 +148,4 @@ get "127.0.0.1:${port}/metrics" | grep -E -v "${skip_re}" > "${tmpdir}/e2e-outpu
 
 diff -u \
   "${fixture}" \
-  "${tmpdir}/e2e-output.txt"
+  "${tmpdir}/e2e-output.txt"