libnm/keyfile: merge keyfile sources (pt1, rename nm-keyfile-reader.c)

I am going to merge the files for keyfile handling in libnm-core.
There is a reason for that, I'll tell you next.

Makefile.am

@@ -502,7 +502,7 @@ libnm_core_lib_c_real = \
 	libnm-core/nm-connection.c \
 	libnm-core/nm-dbus-utils.c \
 	libnm-core/nm-errors.c \
-	libnm-core/nm-keyfile-reader.c \
+	libnm-core/nm-keyfile.c \
 	libnm-core/nm-keyfile-utils.c \
 	libnm-core/nm-keyfile-writer.c \
 	libnm-core/nm-property-compare.c \

libnm-core/meson.build

@@ -103,7 +103,7 @@ libnm_core_sources = libnm_core_settings_sources + files(
   'nm-connection.c',
   'nm-dbus-utils.c',
   'nm-errors.c',
-  'nm-keyfile-reader.c',
+  'nm-keyfile.c',
   'nm-keyfile-utils.c',
   'nm-keyfile-writer.c',
   'nm-property-compare.c',

po/POTFILES.in

@@ -55,7 +55,7 @@ libnm-core/crypto_gnutls.c
 libnm-core/crypto_nss.c
 libnm-core/nm-connection.c
 libnm-core/nm-dbus-utils.c
-libnm-core/nm-keyfile-reader.c
+libnm-core/nm-keyfile.c
 libnm-core/nm-keyfile-writer.c
 libnm-core/nm-setting-8021x.c
 libnm-core/nm-setting-adsl.c