MINOR: checks: Use ver keyword to specify the HTTP version for http checks

'ver' keyword is already used by sample fetches while 'vsn' is not used anywhere
else. So better to use 'ver' too for http-check send rules.
diff --git a/doc/configuration.txt b/doc/configuration.txt
index 6e39c89..1348891 100644
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -4644,7 +4644,7 @@
              and "http-check send".
 
 
-http-check send [meth <method>] [uri <uri>] [vsn <version>] [comment <msg>]
+http-check send [meth <method>] [uri <uri>] [ver <version>] [comment <msg>]
                 [hdr <name> <fmt>]* [body <string>]
   Add a possible list of headers and/or a body to the request sent during HTTP
   health checks.
@@ -4664,7 +4664,7 @@
                    any server, but may be changed to any other URI. Query
                    strings are permitted.
 
-    vsn <version>  is the optional HTTP version string. It defaults to
+    ver <version>  is the optional HTTP version string. It defaults to
                    "HTTP/1.0" but some servers might behave incorrectly in HTTP
                    1.0, so turningit to HTTP/1.1 may sometimes help. Note that
                    the Host field is mandatory in HTTP/1.1, use "hdr" argument
diff --git a/reg-tests/checks/http-check.vtc b/reg-tests/checks/http-check.vtc
index 7d8d514..057484f 100644
--- a/reg-tests/checks/http-check.vtc
+++ b/reg-tests/checks/http-check.vtc
@@ -103,7 +103,7 @@
     backend be3
         log ${S1_addr}:${S1_port} len 2048 local0
         option httpchk
-        http-check send meth GET uri /status vsn HTTP/1.1
+        http-check send meth GET uri /status ver HTTP/1.1
         server srv ${s3_addr}:${s3_port} check inter 100ms rise 1 fall 1
 
     backend be4
@@ -113,11 +113,11 @@
         http-check send-state
         http-check connect addr ${s4_addr}:${s4_port}
         http-check set-var(check.server) "str(srv)"
-        http-check send meth GET uri /req1 vsn HTTP/1.1 hdr x-test "server=%[var(check.server)]"
+        http-check send meth GET uri /req1 ver HTTP/1.1 hdr x-test "server=%[var(check.server)]"
         http-check expect status 200
         http-check connect addr ${s4_addr} port ${s4_port}
         http-check unset-var(check.server)
-        http-check send meth GET uri /req2 vsn HTTP/1.1 hdr x-test "server=%[var(check.server)]" body "health-check body"
+        http-check send meth GET uri /req2 ver HTTP/1.1 hdr x-test "server=%[var(check.server)]" body "health-check body"
         http-check expect rstatus "^2[0-9]{2}"
         http-check connect addr ${s4_addr} port ${s4_port}
         http-check send meth GET uri /req3
diff --git a/src/checks.c b/src/checks.c
index 0b934b6..4279290 100644
--- a/src/checks.c
+++ b/src/checks.c
@@ -3758,7 +3758,7 @@
 			uri = args[cur_arg];
 			// TODO: log-format uri
 		}
-		else if (strcmp(args[cur_arg], "vsn") == 0) {
+		else if (strcmp(args[cur_arg], "ver") == 0) {
 			if (!*(args[cur_arg+1])) {
 				memprintf(errmsg, "'%s' expects a string as argument.", args[cur_arg]);
 				goto error;
@@ -3799,7 +3799,7 @@
 			}
 		}
 		else {
-			memprintf(errmsg, "expects 'comment', 'meth', 'uri', 'hdr' and 'body' but got '%s' as argument.",
+			memprintf(errmsg, "expects 'comment', 'meth', 'uri', 'ver', 'hdr' and 'body' but got '%s' as argument.",
 				  args[cur_arg]);
 			goto error;
 		}