vendor c/common

Also update the e2e pull test to account for the changes when pulling
from the dir transport.  Images pulled via the dir transport are not
tagged anymore; the path is not a reliable source.

Signed-off-by: Valentin Rothberg <rothberg@redhat.com>

vendor/github.com/containers/common/pkg/util/util.go

@@ -0,0 +1,24 @@
+package util
+
+import "regexp"
+
+// StringInSlice determines if a string is in a string slice, returns bool
+func StringInSlice(s string, sl []string) bool {
+	for _, i := range sl {
+		if i == s {
+			return true
+		}
+	}
+	return false
+}
+
+// StringMatchRegexSlice determines if a given string matches one of the given regexes, returns bool
+func StringMatchRegexSlice(s string, re []string) bool {
+	for _, r := range re {
+		m, err := regexp.MatchString(r, s)
+		if err == nil && m {
+			return true
+		}
+	}
+	return false
+}