Ubuntu HA deployment failed. " undefined method `<<' for {}:Hash"

[Nikolay Fedotov]

ISO: {"release": "3.2.1", "nailgun_sha": "26dddea2c1e5ff1a60e06fc337dbf30426515e4f", "ostf_sha": "b7e1f8ab92ab0bd4bbf0ae8785daa59ac1be116e", "astute_sha": "df6ddea3abc93fbe1cab9b4534d4d5e9508c95d6", "fuellib_sha": "8f3960146e9eb9d37d78e3373eb6118a26d7dfd9"}

*Steps*
- Create environment Ubuntu HA
- Add nodes: 3 controller, 1 compute
- Deploy changes

*result*
deployment fails
errors in syslog (controller nodes):
Nov 24 21:20:03 node-1 puppet-agent[1147]: Could not retrieve catalog from remote server: Error 400 on SERVER: undefined method `<<' for {}:Hash on node node-1.test.domain.local
Nov 24 21:20:35 node-1 puppet-agent[2518]: Could not retrieve catalog from remote server: Error 400 on SERVER: undefined method `<<' for {}:Hash on node node-1.test.domain.local
Nov 24 21:20:56 node-1 puppet-agent[3101]: Could not retrieve catalog from remote server: Error 400 on SERVER: undefined method `<<' for {}:Hash on node node-1.test.domain.local

[Sergey Vasilenko (xenolog)]

https://github.com/Mirantis/fuel/pull/876

[Nastya Urlapova (aurlapova)]

verified on iso #73
"release": "3.2.1",
"nailgun_sha": "523b673edadb41f076284f2ca389b6724c64693c",
"ostf_sha": "ea44d89ebe4e4fc7e24f64a3bdc6f9be6bcea9f6",
"astute_sha": "df6ddea3abc93fbe1cab9b4534d4d5e9508c95d6",
"fuellib_sha": "555081c25d85250c04e568f2287768387614ed5d"