tree-wide: Ensure source file names are unique

Let's ensure all of our source file names are unique without having
to take the directory into account.

This allows us to create meson targets or unit tests identified by the
the name of the source file they operate on without having to include
the full path of the source file in the target or test name to avoid
conflicts.

src/network/meson.build

@@ -116,8 +116,8 @@ systemd_networkd_extract_sources = files(
 
 systemd_networkd_wait_online_sources = files(
         'wait-online/dns-configuration.c',
-        'wait-online/link.c',
-        'wait-online/manager.c',
+        'wait-online/wait-online-link.c',
+        'wait-online/wait-online-manager.c',
         'wait-online/wait-online.c',
 )
 
@@ -229,7 +229,7 @@ executables += [
         },
         libexec_template + {
                 'name' : 'systemd-network-generator',
-                'sources' : files('generator/network-generator.c', 'generator/main.c'),
+                'sources' : files('generator/network-generator.c', 'generator/network-generator-main.c'),
                 'extract' : files('generator/network-generator.c'),
                 'link_with' : networkd_link_with,
         },

src/network/wait-online/wait-online-link.c

@@ -6,10 +6,10 @@
 #include "dns-configuration.h"
 #include "format-ifname.h"
 #include "hashmap.h"
-#include "link.h"
-#include "manager.h"
 #include "string-util.h"
 #include "strv.h"
+#include "wait-online-link.h"
+#include "wait-online-manager.h"
 
 static Link* link_free(Link *l) {
 

src/network/wait-online/wait-online-manager.c

@@ -11,11 +11,12 @@
 #include "alloc-util.h"
 #include "dns-configuration.h"
 #include "json-util.h"
-#include "link.h"
-#include "manager.h"
 #include "netlink-util.h"
+#include "string-util.h"
 #include "strv.h"
 #include "time-util.h"
+#include "wait-online-link.h"
+#include "wait-online-manager.h"
 
 static bool link_in_command_line_interfaces(Link *link, Manager *m) {
         assert(link);

src/network/wait-online/wait-online.c

@@ -11,12 +11,12 @@
 #include "daemon-util.h"
 #include "log.h"
 #include "main-func.h"
-#include "manager.h"
 #include "parse-argument.h"
 #include "pretty-print.h"
 #include "signal-util.h"
 #include "socket-util.h"
 #include "strv.h"
+#include "wait-online-manager.h"
 
 static bool arg_quiet = false;
 static usec_t arg_timeout = 120 * USEC_PER_SEC;