Work around bats corrupting IFS

CentOS, as of bats-0.4.0-1.20141016git3b33a5a.el7.noarch, misses the fix
for sstephenson/bats#89 , causing (read) not
to split words at white space.

Set IFS to the default value explicitly to work around this.

Signed-off-by: Miloslav Trmač <mitr@redhat.com>

systemtest/010-inspect.bats

@@ -44,7 +44,7 @@ load helpers
     #
     # The reason for a hardcoded list, instead of 'jq keys', is that RepoTags
     # is always empty locally, but a list remotely.
-    while read key expect; do
+    while IFS=$' \t\n' read key expect; do
         local=$(echo "$inspect_local" | jq -r ".$key")
         remote=$(echo "$inspect_remote" | jq -r ".$key")
 

systemtest/050-signing.bats

@@ -96,7 +96,7 @@ END_POLICY_JSON
 
     # Push a bunch of images. Do so *without* --policy flag; this lets us
     # sign or not, creating images that will or won't conform to policy.
-    while read path sig comments; do
+    while IFS=$' \t\n' read path sig comments; do
         local sign_opt=
         if [[ $sig != '-' ]]; then
             sign_opt="--sign-by=${sig}@test.redhat.com"
@@ -117,7 +117,7 @@ END_PUSH
     # Done pushing. Now try to fetch. From here on we use the --policy option.
     # The table below lists the paths to fetch, and the expected errors (or
     # none, if we expect them to pass).
-    while read path expected_error; do
+    while IFS=$' \t\n' read path expected_error; do
         expected_rc=
         if [[ -n $expected_error ]]; then
             expected_rc=1