test: restore cfgfile tests

These tests were not built since the conversion to meson.
Instead of using embedded resource functions, put data in include
file and generate temporary file before the test.

The changes to app/test/meson.build are to handle auto-generated
files (resources) differently. Don't scan these files to look
for test input.

Using common unit test macro allows for simpler management
of more tests.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>

app/meson.build

@@ -55,6 +55,7 @@ foreach app:apps
     build = true
     reason = '<unknown reason>' # set if build == false to explain
     sources = []
+    resources = []
     includes = []
     cflags = default_cflags
     ldflags = default_ldflags
@@ -115,7 +116,7 @@ foreach app:apps
     endif
 
     exec = executable('dpdk-' + name,
-            sources,
+            [ sources, resources ],
             c_args: cflags,
             link_args: ldflags,
             link_whole: link_libs,

app/test/meson.build

@@ -36,7 +36,7 @@ source_file_deps = {
     'test_bitratestats.c': ['metrics', 'bitratestats', 'ethdev'] + sample_packet_forward_deps,
     'test_bpf.c': ['bpf', 'net'],
     'test_byteorder.c': [],
-#    'test_cfgfile.c': ['cfgfile'],
+    'test_cfgfile.c': ['cfgfile'],
     'test_cksum.c': ['net'],
     'test_cksum_perf.c': ['net'],
     'test_cmdline.c': [],
@@ -265,3 +265,7 @@ if not is_windows
             build_by_default: true,
             install: false)
 endif
+
+subdir('test_cfgfiles')
+
+resources += test_cfgfile_h