ibrdtn-tools: new package

ibrdtn-tools: new package

[Thomas:
  - include package/ibrdtn-tools/Config.in from package/Config.in
  - fix the Config.in option name: we don't use - in option names, it
    should be replaced by _. Also do the same change in the .mk file.
  - from Config.in, don't select BR2_PACKAGE_IBRDTND (it's not a
    dependency of ibrdtn-tools), but instead select
    BR2_PACKAGE_IBRCOMMON and BR2_PACKAGE_IBRDTN.
  - in the Config.in file, fix the comment dependency logic (we want
    the comment to be shown when either thread support *or* C++
    support is missing)
  - add hash file.
  - do not install to staging, since the package does not install any
    library
  - remove IBRDTN_TOOLS_SOURCE variable, since it's equal to the
    default value
  - add ibrcommon, ibrdtn and host-pkgconf as mandatory dependencies,
    and handle libdaemon and libarchive as optional dependencies.
  - remove custom INSTALL_STAGING_OPTS and INSTALL_TARGET_OPTS:
    automake is used, so there's no need for any hack.]

Signed-off-by: Tom Sparks <tom_a_sparks@yahoo.com.au>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>