Increase MODIFY_WAIT_AFTER_SECONDS to 90 (#101)

It looks like we have more than one flaky test. So ideally we want to
increase the root `MODIFY_WAIT_AFTER_SECONDS` to 90 seconds.

Signed-off-by: Amine Hilaly <hilalyamine@gmail.com>

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

Author: a-hilaly

test/e2e/tests/test_table.py

@@ -31,7 +31,7 @@
 RESOURCE_PLURAL = "tables"
 
 DELETE_WAIT_AFTER_SECONDS = 15
-MODIFY_WAIT_AFTER_SECONDS = 30
+MODIFY_WAIT_AFTER_SECONDS = 90
 
 def new_gsi_dict(index_name: str, hash_key: str, read_write_pt: int):
     return {
@@ -348,7 +348,7 @@ def test_enable_stream_specification(self, table_lsi):
         table.wait_until(
             table_name,
             table.stream_specification_matches(False),
-            timeout_seconds=MODIFY_WAIT_AFTER_SECONDS*3,
+            timeout_seconds=MODIFY_WAIT_AFTER_SECONDS,
             interval_seconds=3,
         )