fix tags not resolving to username if email is present (#2309)

* ensure valid tags is populated on user gets too

Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>

* ensure forced tags are added

Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>

* remove unused envvar in test

Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>

* debug log auth/unauth tags in policy man

Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>

* defer shutdown in tags test

Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>

* add tag test with groups

Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>

* add email, display name, picture to create user

Updates #2166

Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>

* add ability to set display and email to cli

Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>

* add email to test users in integration

Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>

* fix issue where tags were only assigned to email, not username

Fixes #2300
Fixes #2307

Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>

* expand principles to correct login name

and if fix an issue where nodeip principles might not expand to all
relevant IPs instead of taking the first in a prefix.

Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>

* fix ssh unit test

Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>

* update cli and oauth tests for users with email

Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>

* index by test email

Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>

* fix last test

Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>

---------

Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>

integration/hsic/hsic.go

@@ -702,7 +702,7 @@ func (t *HeadscaleInContainer) WaitForRunning() error {
 func (t *HeadscaleInContainer) CreateUser(
 	user string,
 ) error {
-	command := []string{"headscale", "users", "create", user}
+	command := []string{"headscale", "users", "create", user, fmt.Sprintf("--email=%s@test.no", user)}
 
 	_, _, err := dockertestutil.ExecuteCommand(
 		t.container,