test-unit-name: add more tests

Add more test cases for:
- unit_name_is_instance
- unit_name_to_instance

Add tests for:
- unit_name_template
- unit_name_is_template
systemctl: handle correctly template units for edit verb

Previously, if we provided getty@.service to systemctl edit it would
have failed when using the bus because it is an invalid unit name.
But it would have succeeded when searching in the filesystem.

Now, we check if we have a template, if we do we search in the
filesystem, if we don't have a templae and we can use the bus, we do.

Furthermore, if we provided getty@tty1.service it would not have worked
when searching the filesystem, but it would have worked with the bus.
So now, when using the filesystem we use the template name and not the
unit name, and the same when logging errors.

(Also did a refactoring to avoid a long function)
build-sys: always distribute systemd-consoled.service.in

Similar to how we handle other facilities that can be flagged out at
configure time, we should always distribute this input file.

http://lists.freedesktop.org/archives/systemd-devel/2014-December/026272.html
build-sys: fix distcheck

- fix misspelling in filename (intenal -> internal)
- remove deleted hwdb-related file (nuked with sd-hwdb refactor)
build-sys: remove commented-out m4 from user@.service

Otherwise this actually remains in the generated unit in /usr/lib.

If you want to keep it commented out, a m4-compatible way would be:

    m4_ifdef(`HAVE_SMACK',
    dnl Capabilities=cap_mac_admin=i
    dnl SecureBits=keep-caps
    )
delta: fix output alignment of [REDIRECTED] entries
blkid: Warn when rejecting a superblock with a bad csum

Bump libblkid requirement from 2.20 to 2.24.
util-linux 2.25 is actually required since fdbbad981cc5da8bb4ed7e9b6646e7a114745ec5
networkd: Introduce Link Layer Discovery Protocol (LLDP)

This patch introduces LLDP support to networkd. it implements the
receiver side of the protocol.

The Link Layer Discovery Protocol (LLDP) is an industry-standard,
vendor-neutral method to allow networked devices to advertise
capabilities, identity, and other information onto a LAN. The Layer 2
protocol, detailed in IEEE 802.1AB-2005.LLDP allows network devices
that operate at the lower layers of a protocol stack (such as
Layer 2 bridges and switches) to learn some of the capabilities
and characteristics of LAN devices available to higher
layer protocols.
networkd: integrate LLDP

This patch integrates LLDP with networkd.

Example conf:
file : lldp.network

[Match]
Name=em1

[Network]
LLDP=yes
LLDP: Add support for networkctl