Support Go execd plugins with shim (#7283)

config/testdata/subconfig/exec.conf

@@ -0,0 +1,4 @@
+[[inputs.exec]]
+  # the command to run
+  command = "/usr/bin/myothercollector --foo=bar"
+  name_suffix = "_myothercollector"

config/testdata/subconfig/memcached.conf

@@ -0,0 +1,11 @@
+[[inputs.memcached]]
+  servers = ["192.168.1.1"]
+  namepass = ["metricname1"]
+  namedrop = ["metricname2"]
+  pass = ["some", "strings"]
+  drop = ["other", "stuff"]
+  interval = "5s"
+  [inputs.memcached.tagpass]
+    goodtag = ["mytag"]
+  [inputs.memcached.tagdrop]
+    badtag = ["othertag"]

config/testdata/subconfig/procstat.conf

@@ -0,0 +1,2 @@
+[[inputs.procstat]]
+  pid_file = "/var/run/grafana-server.pid"