oeqa/commands: don't break if get_bb_vars is passed a tuple

get_bb_vars was using variables.copy() to duplicate the list of variables passed
but this function only exists in lists [1,2] and not tuples (1,2).

Instead of throwing an exception if the variables are in a tuple, simply
construct a new list using the passed sequence-like object.

(From OE-Core rev: b5837f62c8af94d134cf2160afdfb9e08b3418d1)

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/utils/commands.py

@@ -227,7 +227,7 @@ def get_bb_vars(variables=None, target=None, postconfig=None):
     bbenv = get_bb_env(target, postconfig=postconfig)
 
     if variables is not None:
-        variables = variables.copy()
+        variables = list(variables)
     var_re = re.compile(r'^(export )?(?P<var>\w+(_.*)?)="(?P<value>.*)"$')
     unset_re = re.compile(r'^unset (?P<var>\w+)$')
     lastline = None