Issue #179 Split handleJenkinsUIRequest() into smaller methods

	- Splitted handleJenkinsUIRequest() to smaller methods
	- Added error package, removed naked returns, decreased returned parameters
	- Added tests

internal/proxy/mock_idler.go

@@ -0,0 +1,27 @@
+package proxy
+
+type mockIdler struct {
+	idlerAPI string
+	isIdle   bool
+}
+
+// IsIdle returns mockIdler.isIdle
+func (i *mockIdler) IsIdle(tenant string, openShiftAPIURL string) (bool, error) {
+	return i.isIdle, nil
+}
+
+// UnIdle always unidles (mock)
+func (i *mockIdler) UnIdle(tenant string, openShiftAPIURL string) error {
+	return nil
+}
+
+// Clusters returns a map which maps the OpenShift API URL to the application DNS for this cluster. An empty map together with
+// an error is returned if an error occurs.
+func (i *mockIdler) Clusters() (map[string]string, error) {
+	clusters := map[string]string{
+		"https://api.free-stg.openshift.com/":           "1b7d.free-stg.openshiftapps.com",
+		"https://api.starter-us-east-2a.openshift.com/": "b542.starter-us-east-2a.openshiftapps.com",
+	}
+
+	return clusters, nil
+}

internal/proxy/mock_login.go

@@ -0,0 +1,47 @@
+package proxy
+
+import (
+	"net/http"
+
+	"errors"
+
+	log "github.com/sirupsen/logrus"
+)
+
+type mockLogin struct {
+	isLoggedIn   bool
+	isTokenValid bool
+	giveOSOToken bool
+}
+
+// loginJenkins always logs in
+func (l *mockLogin) loginJenkins(pci CacheItem, osoToken string, requestLogEntry *log.Entry) (int, []*http.Cookie, error) {
+	c := &http.Cookie{
+		Name:  "JSESSIONID",
+		Value: "Some Session ID",
+	}
+	return 200, []*http.Cookie{c}, nil
+}
+
+func (l *mockLogin) processToken(tokenData []byte, requestLogEntry *log.Entry, p *Proxy) (pci *CacheItem, osioToken string, err error) {
+
+	if !l.isTokenValid {
+		return nil, "", errors.New("Could not Process Token Properly")
+	}
+	pci = &CacheItem{
+		ClusterURL: "https://api.free-stg.openshift.com/",
+		NS:         "someNameSpace",
+		Route:      "1b7d.free-stg.openshiftapps.com",
+		Scheme:     "",
+	}
+
+	return pci, "OSIO_TOKEN", nil
+}
+
+func (l *mockLogin) GetOSOToken(authURL string, clusterURL string, token string) (osoToken string, err error) {
+	if l.giveOSOToken {
+		return "valid OSO Token", nil
+	}
+
+	return "", errors.New("Could not get valid OSO Token")
+}