Add bind command to sdir tool.
Add bind command to sdir tool.

When doing localhost unit testing, the Supervisor cannot be used
and app processes all run under the same user ID. Therefore, even
if binding configuration generated by the mk tools were loaded
into the Service Directory, it would be incorrect.

It is possible to hand-enter alternative bindings into the
Config Tree from the command line using the 'config' tool and then
run 'sdir load' to load that configuration into the
Service Directory, but it's extremely awkward and error-prone.

The 'sdir bind' command is added to help facilitate testing.

Resolves: LE-9636
Change-Id: I11b5c1c4da8511c5a48596ed35376a9969f10dfd

legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af