MT#8397 Remove usage of Sys::Sig

Build.PL

@@ -113,7 +113,6 @@ my $builder = Local::Module::Build->new(
         'Test::mysqld' => 0,
         'Test::WebDriver' => 0,
         'strict' => 0,
-        'Sys::Sig' => 0,
         'Test::WWW::Mechanize::Catalyst' => 0,
         'URI' => 0,
         'warnings' => 0,

debian/control

@@ -52,7 +52,6 @@ Build-Depends: debhelper (>= 8),
                libsereal-encoder-perl,
                libsipwise-base-perl,
                libstring-mkpasswd-perl,
-               libsys-sig-perl,
                libtemplate-plugin-json-escape-perl,
                libtest-mockobject-perl,
                libtext-csv-xs-perl,
@@ -128,7 +127,6 @@ Depends: gettext,
          libsereal-decoder-perl,
          libsereal-encoder-perl,
          libstring-mkpasswd-perl,
-         libsys-sig-perl,
          libtemplate-perl,
          libtemplate-plugin-json-escape-perl,
          libtest-mockobject-perl,

inc/Local/Module/Build.pm

@@ -29,8 +29,7 @@ method wait_socket($host, $port, $timeout=90) {
 sub shutdown_servers {
     for my $proc ($webdriver, $plackup) {
         if ($proc) {
-            require Sys::Sig;
-            $proc->kill(Sys::Sig->TERM);
+            $proc->kill('TERM');
         }
     }
 }