version-0.5.8: version 0.5.8

• updater: reverse resolve ip address if dhcp server does not
  provide a hostname (bnc#861476).
• debug: init debug and log level from environment using DEBUG,
  WICKED_DEBUG= and WICKED_LOG_LEVEL= variables.
• dhcp4: check link before start, confirm lease on link change
  and do not discard lease if host does not match
• dhcp4: modprobe af_packet, omit arp validation when address
  already set on link.
• dhcp6: start when link + link-address ready, not network up
• dhcp: provide addrconf lease and leaseinfo details
• leaseinfo: consistently use prefixlen in ROUTES
• wireless: do not remove link/network up flags (bnc#863371)
• libwicked: libtool -version-info making package and library
  versions independent.
• cleaned up unused schema files and extensions scripts
• lldp: do not log error when lldp is not supported (bnc#862790)
• ibft: fixed reading of the origin field
• iftypes: show s390 ctcm and iucv (slip) devices, not unknown