Only return passwords that include letters.

Password decryption can fail if the database password is all numbers because ruby will read it as an integer instead of a string.

== Checking deployment status ==
rake aborted!
NoMethodError: undefined method `empty?' for 8783875645714351:Integer
.../gems/manageiq-password-1.2.0/lib/manageiq/password.rb:165:in `remove_erb'
.../gems/manageiq-password-1.2.0/lib/manageiq/password.rb:90:in `try_decrypt'
/var/www/miq/vmdb/lib/vmdb/settings_walker.rb:76:in `block in decrypt_passwords!'

manageiq-operator/api/v1alpha1/helpers/miq-components/generators.go

@@ -4,6 +4,7 @@ import (
 	"crypto/rand"
 	"encoding/base64"
 	"encoding/hex"
+	"regexp"
 )
 
 func randomBytes(n int) []byte {
@@ -20,6 +21,13 @@ func generateEncryptionKey() string {
 }
 
 func generatePassword() string {
-	buf := randomBytes(8)
-	return hex.EncodeToString(buf)
+	for {
+		buf := randomBytes(8)
+		password := hex.EncodeToString(buf)
+		if match, err := regexp.MatchString(`\D+`, password); err == nil && match {
+			// Only return if a letter is included.
+			// Password decryption can fail if the database password is all numbers because ruby will read it as an integer instead of a string.
+			return password
+		}
+	}
 }