Add SReclaimable and SUnreclaim to mem input

Gopkg.toml

@@ -144,7 +144,7 @@
 
 [[constraint]]
   name = "github.com/shirou/gopsutil"
-  version = "2.18.12"
+  version = "2.19.7"
 
 [[constraint]]
   name = "github.com/Shopify/sarama"

plugins/inputs/mem/README.md

@@ -43,6 +43,8 @@ Available fields are dependent on platform.
     - mapped (integer)
     - page_tables (integer)
     - shared (integer)
+    - sreclaimable (integer)
+    - sunreclaim (integer)
     - swap_cached (integer)
     - swap_free (integer)
     - swap_total (integer)
@@ -54,5 +56,5 @@ Available fields are dependent on platform.
 
 ### Example Output:
 ```
-mem active=11347566592i,available=18705133568i,available_percent=89.4288960571006,buffered=1976709120i,cached=13975572480i,commit_limit=14753067008i,committed_as=2872422400i,dirty=87461888i,free=1352400896i,high_free=0i,high_total=0i,huge_page_size=2097152i,huge_pages_free=0i,huge_pages_total=0i,inactive=6201593856i,low_free=0i,low_total=0i,mapped=310427648i,page_tables=14397440i,shared=200781824i,slab=1937526784i,swap_cached=0i,swap_free=4294963200i,swap_total=4294963200i,total=20916207616i,used=3611525120i,used_percent=17.26663449848977,vmalloc_chunk=0i,vmalloc_total=35184372087808i,vmalloc_used=0i,wired=0i,write_back=0i,write_back_tmp=0i 1536704085000000000
+mem active=9299595264i,available=16818249728i,available_percent=80.41654254645131,buffered=2383761408i,cached=13316689920i,commit_limit=14751920128i,committed_as=11781156864i,dirty=122880i,free=1877688320i,high_free=0i,high_total=0i,huge_page_size=2097152i,huge_pages_free=0i,huge_pages_total=0i,inactive=7549939712i,low_free=0i,low_total=0i,mapped=416763904i,page_tables=19787776i,shared=670679040i,slab=2081071104i,sreclaimable=1923395584i,sunreclaim=157675520i,swap_cached=1302528i,swap_free=4286128128i,swap_total=4294963200i,total=20913917952i,used=3335778304i,used_percent=15.95004011996231,vmalloc_chunk=0i,vmalloc_total=35184372087808i,vmalloc_used=0i,wired=0i,write_back=0i,write_back_tmp=0i 1574712869000000000
 ```

plugins/inputs/mem/memory.go

@@ -50,6 +50,8 @@ func (s *MemStats) Gather(acc telegraf.Accumulator) error {
 		"mapped":            vm.Mapped,
 		"page_tables":       vm.PageTables,
 		"shared":            vm.Shared,
+		"sreclaimable":      vm.SReclaimable,
+		"sunreclaim":        vm.SUnreclaim,
 		"swap_cached":       vm.SwapCached,
 		"swap_free":         vm.SwapFree,
 		"swap_total":        vm.SwapTotal,

plugins/inputs/mem/memory_test.go

@@ -40,6 +40,8 @@ func TestMemStats(t *testing.T) {
 		Mapped:         42236,
 		PageTables:     1236,
 		Shared:         0,
+		SReclaimable:   1923022848,
+		SUnreclaim:     157728768,
 		SwapCached:     0,
 		SwapFree:       524280,
 		SwapTotal:      524280,
@@ -81,6 +83,8 @@ func TestMemStats(t *testing.T) {
 		"mapped":            uint64(42236),
 		"page_tables":       uint64(1236),
 		"shared":            uint64(0),
+		"sreclaimable":      uint64(1923022848),
+		"sunreclaim":        uint64(157728768),
 		"swap_cached":       uint64(0),
 		"swap_free":         uint64(524280),
 		"swap_total":        uint64(524280),