Decouple ServiceUpdate to ServerUpdate to be more native (#8138)

The change now is to ensure that we take custom URL as
well for updating the deployment, this is required for
hotfix deliveries for certain deployments - other than
the community release.

This commit changes the previous work d65a2c6725
with newer set of requirements.

Also deprecates PeerUptime()

cmd/peer-rest-common.go

@@ -27,6 +27,7 @@ const (
 	peerRESTMethodMemUsageInfo             = "memusageinfo"
 	peerRESTMethodDrivePerfInfo            = "driveperfinfo"
 	peerRESTMethodDeleteBucket             = "deletebucket"
+	peerRESTMethodServerUpdate             = "serverupdate"
 	peerRESTMethodSignalService            = "signalservice"
 	peerRESTMethodBackgroundHealStatus     = "backgroundhealstatus"
 	peerRESTMethodBackgroundOpsStatus      = "backgroundopsstatus"
@@ -53,17 +54,20 @@ const (
 )
 
 const (
-	peerRESTNetPerfSize = "netperfsize"
-	peerRESTBucket      = "bucket"
-	peerRESTUser        = "user"
-	peerRESTGroup       = "group"
-	peerRESTUserTemp    = "user-temp"
-	peerRESTPolicy      = "policy"
-	peerRESTUserOrGroup = "user-or-group"
-	peerRESTIsGroup     = "is-group"
-	peerRESTSignal      = "signal"
-	peerRESTProfiler    = "profiler"
-	peerRESTDryRun      = "dry-run"
-	peerRESTTraceAll    = "all"
-	peerRESTTraceErr    = "err"
+	peerRESTNetPerfSize   = "netperfsize"
+	peerRESTBucket        = "bucket"
+	peerRESTUser          = "user"
+	peerRESTGroup         = "group"
+	peerRESTUserTemp      = "user-temp"
+	peerRESTPolicy        = "policy"
+	peerRESTUserOrGroup   = "user-or-group"
+	peerRESTIsGroup       = "is-group"
+	peerRESTUpdateURL     = "updateURL"
+	peerRESTSha256Hex     = "sha256Hex"
+	peerRESTLatestRelease = "latestReleaseTime"
+	peerRESTSignal        = "signal"
+	peerRESTProfiler      = "profiler"
+	peerRESTDryRun        = "dry-run"
+	peerRESTTraceAll      = "all"
+	peerRESTTraceErr      = "err"
 )