As we started using jq it makes sento to use it everywhere when
building a resulting JSON.
Also removes some unneeded code.
Change-Id: Ib1391dc9f4e1463a9a3d0c13909ff60e3c993e82
When setting IPMI credentials is requested, ironic-discoverd
will return ipmi_setup_credentials=true, ipmi_username and ipmi_password
in response. Use ipmitool to set credentials in this case.
Change-Id: I8ace9e817e5ce9dbfb8564feec4a3ce6c0e1b233