initial capver packet tracking version (#2391)

* initial capver packet tracking version

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

* Log the minimum version as client version, not only capver

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

* remove old versions

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

* use capver for integration tests

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

* changelog

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

* patch through m and n key

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

---------

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

hscontrol/capver/capver_generated.go

@@ -0,0 +1,54 @@
+package capver
+
+//Generated DO NOT EDIT
+
+import "tailscale.com/tailcfg"
+
+var tailscaleToCapVer = map[string]tailcfg.CapabilityVersion{
+	"v1.44.3": 63,
+	"v1.56.1": 82,
+	"v1.58.0": 85,
+	"v1.58.1": 85,
+	"v1.58.2": 85,
+	"v1.60.0": 87,
+	"v1.60.1": 87,
+	"v1.62.0": 88,
+	"v1.62.1": 88,
+	"v1.64.0": 90,
+	"v1.64.1": 90,
+	"v1.64.2": 90,
+	"v1.66.0": 95,
+	"v1.66.1": 95,
+	"v1.66.2": 95,
+	"v1.66.3": 95,
+	"v1.66.4": 95,
+	"v1.68.0": 97,
+	"v1.68.1": 97,
+	"v1.68.2": 97,
+	"v1.70.0": 102,
+	"v1.72.0": 104,
+	"v1.72.1": 104,
+	"v1.74.0": 106,
+	"v1.74.1": 106,
+	"v1.76.0": 106,
+	"v1.76.1": 106,
+	"v1.76.6": 106,
+	"v1.78.0": 109,
+	"v1.78.1": 109,
+}
+
+
+var capVerToTailscaleVer = map[tailcfg.CapabilityVersion]string{
+	63:		"v1.44.3",
+	82:		"v1.56.1",
+	85:		"v1.58.0",
+	87:		"v1.60.0",
+	88:		"v1.62.0",
+	90:		"v1.64.0",
+	95:		"v1.66.0",
+	97:		"v1.68.0",
+	102:		"v1.70.0",
+	104:		"v1.72.0",
+	106:		"v1.74.0",
+	109:		"v1.78.0",
+}