Exclude node_arp_entries from e2e tests

With the arp collector now using rtnetlink by default, these need to be
excluded from the e2e tests in the same way that netdev stats are.

Signed-off-by: Daniel Swarbrick <daniel.swarbrick@gmail.com>

collector/fixtures/e2e-64k-page-output.txt

@@ -54,8 +54,6 @@
 # TYPE go_threads gauge
 # HELP node_arp_entries ARP entries by device
 # TYPE node_arp_entries gauge
-node_arp_entries{device="eth0"} 3
-node_arp_entries{device="eth1"} 3
 # HELP node_bcache_active_journal_entries Number of journal entries that are newer than the index.
 # TYPE node_bcache_active_journal_entries gauge
 node_bcache_active_journal_entries{uuid="deaddd54-c735-46d5-868e-f331c5fd7c74"} 1

collector/fixtures/e2e-output.txt

@@ -54,8 +54,6 @@
 # TYPE go_threads gauge
 # HELP node_arp_entries ARP entries by device
 # TYPE node_arp_entries gauge
-node_arp_entries{device="eth0"} 3
-node_arp_entries{device="eth1"} 3
 # HELP node_bcache_active_journal_entries Number of journal entries that are newer than the index.
 # TYPE node_bcache_active_journal_entries gauge
 node_bcache_active_journal_entries{uuid="deaddd54-c735-46d5-868e-f331c5fd7c74"} 1

end-to-end-test.sh

@@ -67,7 +67,7 @@ cd "$(dirname $0)"
 port="$((10000 + (RANDOM % 10000)))"
 tmpdir=$(mktemp -d /tmp/node_exporter_e2e_test.XXXXXX)
 
-skip_re="^(go_|node_exporter_build_info|node_scrape_collector_duration_seconds|process_|node_textfile_mtime_seconds|node_time_(zone|seconds)|node_network_(receive|transmit)_(bytes|packets)_total)"
+skip_re="^(go_|node_exporter_build_info|node_scrape_collector_duration_seconds|process_|node_textfile_mtime_seconds|node_time_(zone|seconds)|node_network_(receive|transmit)_(bytes|packets)_total|node_arp_entries)"
 
 arch="$(uname -m)"