monit service parsing needs to handle multi-line data (sonic-net#18045)

In some circumstances monit can return multiline data for a
value for a service, such as:
This patch adds handling for ignoring multi-line output since
no tests rely on it.

Signed-off-by: Brad House <bhouse@nexthop.ai>
Signed-off-by: Guy Shemesh <gshemesh@nvidia.com>

Author: bhouse-nexthop

tests/memory_checker/test_memory_checker.py

@@ -157,6 +157,12 @@ def parse_monit_output(lines):
             continue
         if service is None:
             continue
+
+        # Ignore line continuations that start with more than 2 whitespace
+        # characters.  We don't need the data at all.
+        if len(line) - len(line.lstrip()) > 2:
+            continue
+
         if line.startswith('  '):
             key, value = line.lstrip().split('  ', 1)
             service[key.replace(' ', '_')] = value.lstrip()