util: move all to shared/ and split external dependencies in separate internal libraries

Before:
  $ ldd /lib/systemd/systemd-timestamp
  linux-vdso.so.1 =>  (0x00007fffb05ff000)
  libselinux.so.1 => /lib64/libselinux.so.1 (0x00007f90aac57000)
  libcap.so.2 => /lib64/libcap.so.2 (0x00007f90aaa53000)
  librt.so.1 => /lib64/librt.so.1 (0x00007f90aa84a000)
  libc.so.6 => /lib64/libc.so.6 (0x00007f90aa494000)
  /lib64/ld-linux-x86-64.so.2 (0x00007f90aae90000)
  libdl.so.2 => /lib64/libdl.so.2 (0x00007f90aa290000)
  libattr.so.1 => /lib64/libattr.so.1 (0x00007f90aa08a000)
  libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f90a9e6e000)

After:
  $ ldd systemd-timestamp
  linux-vdso.so.1 =>  (0x00007fff3cbff000)
  libselinux.so.1 => /lib64/libselinux.so.1 (0x00007f5eaa1c3000)
  librt.so.1 => /lib64/librt.so.1 (0x00007f5ea9fbb000)
  libc.so.6 => /lib64/libc.so.6 (0x00007f5ea9c04000)
  /lib64/ld-linux-x86-64.so.2 (0x00007f5eaa3fc000)
  libdl.so.2 => /lib64/libdl.so.2 (0x00007f5ea9a00000)
  libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f5ea97e4000)

1 files changed, 0 insertions, 102 deletions

diff --git a/src/socket-util.h b/src/socket-util.h
deleted file mode 100644
index 8ccbd371cf..0000000000
--- a/src/socket-util.h
+++ /dev/null
@@ -1,102 +0,0 @@
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
-#ifndef foosocketutilhfoo
-#define foosocketutilhfoo
-
-/***
-  This file is part of systemd.
-
-  Copyright 2010 Lennart Poettering
-
-  systemd is free software; you can redistribute it and/or modify it
-  under the terms of the GNU General Public License as published by
-  the Free Software Foundation; either version 2 of the License, or
-  (at your option) any later version.
-
-  systemd is distributed in the hope that it will be useful, but
-  WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-  General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
-
-#include <sys/socket.h>
-#include <netinet/in.h>
-#include <sys/un.h>
-#include <net/if.h>
-#include <asm/types.h>
-#include <linux/netlink.h>
-
-#include "macro.h"
-#include "util.h"
-
-union sockaddr_union {
-        struct sockaddr sa;
-        struct sockaddr_in in4;
-        struct sockaddr_in6 in6;
-        struct sockaddr_un un;
-        struct sockaddr_nl nl;
-        struct sockaddr_storage storage;
-};
-
-typedef struct SocketAddress {
-        union sockaddr_union sockaddr;
-
-        /* We store the size here explicitly due to the weird
-         * sockaddr_un semantics for abstract sockets */
-        socklen_t size;
-
-        /* Socket type, i.e. SOCK_STREAM, SOCK_DGRAM, ... */
-        int type;
-
-        /* Socket protocol, IPPROTO_xxx, usually 0, except for netlink */
-        int protocol;
-} SocketAddress;
-
-typedef enum SocketAddressBindIPv6Only {
-        SOCKET_ADDRESS_DEFAULT,
-        SOCKET_ADDRESS_BOTH,
-        SOCKET_ADDRESS_IPV6_ONLY,
-        _SOCKET_ADDRESS_BIND_IPV6_ONLY_MAX,
-        _SOCKET_ADDRESS_BIND_IPV6_ONLY_INVALID = -1
-} SocketAddressBindIPv6Only;
-
-#define socket_address_family(a) ((a)->sockaddr.sa.sa_family)
-
-int socket_address_parse(SocketAddress *a, const char *s);
-int socket_address_parse_netlink(SocketAddress *a, const char *s);
-int socket_address_print(const SocketAddress *a, char **p);
-int socket_address_verify(const SocketAddress *a);
-
-bool socket_address_can_accept(const SocketAddress *a);
-
-int socket_address_listen(
-                const SocketAddress *a,
-                int backlog,
-                SocketAddressBindIPv6Only only,
-                const char *bind_to_device,
-                bool free_bind,
-                bool transparent,
-                mode_t directory_mode,
-                mode_t socket_mode,
-                const char *label,
-                int *ret);
-
-bool socket_address_is(const SocketAddress *a, const char *s, int type);
-bool socket_address_is_netlink(const SocketAddress *a, const char *s);
-
-bool socket_address_equal(const SocketAddress *a, const SocketAddress *b);
-
-bool socket_address_needs_mount(const SocketAddress *a, const char *prefix);
-
-const char* socket_address_bind_ipv6_only_to_string(SocketAddressBindIPv6Only b);
-SocketAddressBindIPv6Only socket_address_bind_ipv6_only_from_string(const char *s);
-
-const char* netlink_family_to_string(int b);
-int netlink_family_from_string(const char *s);
-
-bool socket_ipv6_is_supported(void);
-
-#endif