clientupdate, net/dns: fix some "tailsacle" typos

Updates #cleanup

Change-Id: I982175e74b0c8c5b3e01a573e5785e6596b7ac39
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

clientupdate/systemd_linux.go

@@ -19,11 +19,11 @@ func restartSystemdUnit(ctx context.Context) error {
 	}
 	defer c.Close()
 	if err := c.ReloadContext(ctx); err != nil {
-		return fmt.Errorf("failed to reload tailsacled.service: %w", err)
+		return fmt.Errorf("failed to reload tailscaled.service: %w", err)
 	}
 	ch := make(chan string, 1)
 	if _, err := c.RestartUnitContext(ctx, "tailscaled.service", "replace", ch); err != nil {
-		return fmt.Errorf("failed to restart tailsacled.service: %w", err)
+		return fmt.Errorf("failed to restart tailscaled.service: %w", err)
 	}
 	select {
 	case res := <-ch:

net/dns/direct_test.go

@@ -177,17 +177,17 @@ func TestReadResolve(t *testing.T) {
 		{in: `# nameserver 192.168.0.100`, want: OSConfig{}},
 		{in: `nameserver192.168.0.100`, wantErr: true},
 
-		{in: `search tailsacle.com`,
+		{in: `search tailscale.com`,
 			want: OSConfig{
-				SearchDomains: []dnsname.FQDN{"tailsacle.com."},
+				SearchDomains: []dnsname.FQDN{"tailscale.com."},
 			},
 		},
-		{in: `search tailsacle.com # typo`,
+		{in: `search tailscale.com # comment`,
 			want: OSConfig{
-				SearchDomains: []dnsname.FQDN{"tailsacle.com."},
+				SearchDomains: []dnsname.FQDN{"tailscale.com."},
 			},
 		},
-		{in: `searchtailsacle.com`, wantErr: true},
+		{in: `searchtailscale.com`, wantErr: true},
 		{in: `search`, wantErr: true},
 	}
 

net/dns/resolvconffile/resolvconffile_test.go

@@ -44,17 +44,17 @@ func TestParse(t *testing.T) {
 		{in: `# nameserver 192.168.0.100`, want: &Config{}},
 		{in: `nameserver192.168.0.100`, wantErr: true},
 
-		{in: `search tailsacle.com`,
+		{in: `search tailscale.com`,
 			want: &Config{
-				SearchDomains: []dnsname.FQDN{"tailsacle.com."},
+				SearchDomains: []dnsname.FQDN{"tailscale.com."},
 			},
 		},
-		{in: `search tailsacle.com # typo`,
+		{in: `search tailscale.com # comment`,
 			want: &Config{
-				SearchDomains: []dnsname.FQDN{"tailsacle.com."},
+				SearchDomains: []dnsname.FQDN{"tailscale.com."},
 			},
 		},
-		{in: `searchtailsacle.com`, wantErr: true},
+		{in: `searchtailscale.com`, wantErr: true},
 		{in: `search`, wantErr: true},
 
 		// Issue 6875: there can be multiple search domains, and even if they're