Create config file in merge_config_file

Change If132a94e53545d9134859aa508da7b9819ede2f8 introduced a small
regression; it added an "inidelete" which looks in the config file to
delete rows.

However, at least for the test-case, the config file isn't created
yet.  The end result is that the test fails but we don't notice.

 2015-04-17 00:55:03.169 | merge_config_file test-multiline: sed: can't read test-multiline.conf: No such file or directory
 2015-04-17 00:55:03.195 | OK

So fix this up by creating the config-file if it isn't there.

Also, add "-e" to the test file so we catch things like this in the
future.

Change-Id: I43a4ecc247f19cccf51d5931dfb687adbd23d6b1

inc/meta-config

@@ -86,6 +86,14 @@ function merge_config_file {
     local matchgroup=$2
     local configfile=$3
 
+    # note, configfile might be a variable (note the iniset, etc
+    # created in the mega-awk below is "eval"ed too, so we just leave
+    # it alone.
+    local real_configfile=$(eval echo $configfile)
+    if [ ! -f $real_configfile ]; then
+        touch $real_configfile
+    fi
+
     get_meta_section $file $matchgroup $configfile | \
     $CONFIG_AWK_CMD -v configfile=$configfile '
         BEGIN {

tests/test_meta_config.sh

@@ -8,6 +8,8 @@ TOP=$(cd $(dirname "$0")/.. && pwd)
 source $TOP/inc/ini-config
 source $TOP/inc/meta-config
 
+set -e
+
 # check_result() tests and reports the result values
 # check_result "actual" "expected"
 function check_result {