This is a huge commit, it does following things: (#1942)

1. Remove ks-iam standalone binary, move it to ks-apiserver
2. Generate all devops apis inside kubesphere repository, no need to
import s2ioperator.
3. Reorganize ldap code, make it more flexible to use.

Makefile

@@ -39,7 +39,7 @@ define ALL_HELP_INFO
 #           debugging tools like delve.
 endef
 .PHONY: all
-all: test hypersphere ks-apiserver ks-apigateway ks-iam controller-manager
+all: test hypersphere ks-apiserver ks-apigateway controller-manager
 
 # Build ks-apiserver binary
 ks-apiserver: fmt vet
@@ -49,10 +49,6 @@ ks-apiserver: fmt vet
 ks-apigateway: fmt vet
 	hack/gobuild.sh cmd/ks-apigateway
 
-# Build ks-iam binary
-ks-iam: fmt vet
-	hack/gobuild.sh cmd/ks-iam
-
 # Build controller-manager binary
 controller-manager: fmt vet
 	hack/gobuild.sh cmd/controller-manager