Add missing space to build_timeout description

Change-Id: I2b4ceb5c4c795903454873a6d4882c563499186a
diff --git a/etc/tempest.conf.sample b/etc/tempest.conf.sample
index dfcbaba..8499cac 100644
--- a/etc/tempest.conf.sample
+++ b/etc/tempest.conf.sample
@@ -1100,7 +1100,7 @@
 # value)
 #build_interval=1
 
-# Timeout in seconds to wait for a volume to becomeavailable.
+# Timeout in seconds to wait for a volume to become available.
 # (integer value)
 #build_timeout=300
 
diff --git a/tempest/config.py b/tempest/config.py
index 174a895..d9be5da 100644
--- a/tempest/config.py
+++ b/tempest/config.py
@@ -514,7 +514,7 @@
                help='Time in seconds between volume availability checks.'),
     cfg.IntOpt('build_timeout',
                default=300,
-               help='Timeout in seconds to wait for a volume to become'
+               help='Timeout in seconds to wait for a volume to become '
                     'available.'),
     cfg.StrOpt('catalog_type',
                default='volume',