generate session secret key randomly each application start,

bump app version 1.0.6

test/test_config.json

@@ -3,7 +3,6 @@
     "ldapURL": "ldap://localhost",
     "startTLS": true,
     "basedn": "dc=test,dc=paasldap",
-    "sessionSecretKey": "test",
     "sessionCookieName": "PAASLDAPAuthTicket",
     "sessionCookie": {
         "path": "/",

test/unit_test.go

@@ -18,7 +18,6 @@ func TestConfig_ValidPath(t *testing.T) {
 	AssertEquals(t, "config.ListenPort", config.ListenPort, 80)
 	AssertEquals(t, "config.LdapURL", config.LdapURL, "ldap://localhost")
 	AssertEquals(t, "config.BaseDN", config.BaseDN, "dc=test,dc=paasldap")
-	AssertEquals(t, "config.SessionSecretKey", config.SessionSecretKey, "test")
 	AssertEquals(t, "config.SessionCookieName", config.SessionCookieName, "PAASLDAPAuthTicket")
 	AssertEquals(t, "config.SessionCookie.Path", config.SessionCookie.Path, "/")
 	AssertEquals(t, "config.SessionCookie.HttpOnly", config.SessionCookie.HttpOnly, true)