build-unit-test-docker: minor dependency tweaks

Add explicit dependency for objmgr -> phosphor-dbus-interfaces.
Make formatting more consistent.
Remove googletest dependencies when '-Dtests=disabled' is passed.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I3a3d7aa290c850181a6c2edaeed1af7df8c44d26
1 file changed