ci: use a different starting port for the hg server web server processes in the different tests, to minimise the chances of conflicts

Author: spytheman

cmd/tools/vpm/install_test.v

@@ -183,7 +183,7 @@ fn test_install_from_hg_url() ! {
 	os.write_file(os.join_path(test_module_path, '.hg/hgrc'), '[ui]\nusername = v_ci <v_ci@example.net>\nverbose = False\n')!
 	println('> writing .hg/hgrc done.')
 
-	mut p, mut port := test_utils.hg_serve(hg_path, test_module_path)
+	mut p, mut port := test_utils.hg_serve(hg_path, test_module_path, 2000)
 	// Trying to install it should fail.
 	res = os.execute('${vexe} install --hg http://127.0.0.1:${port}')
 	p.signal_kill()
@@ -198,7 +198,7 @@ fn test_install_from_hg_url() ! {
 	os.chdir(test_module_path)!
 	cmd_ok(@LOCATION, 'hg add')
 	cmd_ok(@LOCATION, 'hg commit -m "add v.mod"')
-	p, port = test_utils.hg_serve(hg_path, test_module_path)
+	p, port = test_utils.hg_serve(hg_path, test_module_path, 3000)
 	// Trying to install the module should work now.
 	res = cmd_ok(@LOCATION, '${vexe} install --hg http://127.0.0.1:${port}')
 	p.signal_kill()

cmd/tools/vpm/install_version_test.v

@@ -148,7 +148,7 @@ fn test_install_from_hg_url_with_version_tag() ! {
 	cmd_ok(@LOCATION, 'hg add')
 	cmd_ok(@LOCATION, 'hg commit -m "bump version to v0.2.0"')
 
-	mut p, port := test_utils.hg_serve(hg_path, test_module_path)
+	mut p, port := test_utils.hg_serve(hg_path, test_module_path, 4000)
 	res = os.execute('${vexe} install -v --hg http://127.0.0.1:${port}@v0.1.0')
 	p.signal_kill()
 	if res.exit_code != 0 {

cmd/tools/vpm/test_utils/utils.v

@@ -12,8 +12,8 @@ pub fn set_test_env(test_path string) {
 	unbuffer_stdout()
 }
 
-pub fn hg_serve(hg_path string, path string) (&os.Process, int) {
-	mut port := 8000
+pub fn hg_serve(hg_path string, path string, start_port int) (&os.Process, int) {
+	mut port := start_port
 	for {
 		if mut l := net.listen_tcp(.ip6, ':${port}') {
 			l.close() or { panic(err) }