LU-9667 lnet: Add o2iblnd connection sysfs structure

LU-9667 lnet: Add o2iblnd connection sysfs structure

Adding APIs to create kobjects and the attribute
files for o2iblnd connections sysfs directory
structure.

Callback functions for the o2iblnd conn attributes
are added in o2iblnd_sysfs.c

Test-Parameters: trivial
Change-Id: I77604757be46af68ecacb4cb425477e70fa4b89b
Signed-off-by: Sonia Sharma <sonia.sharma@intel.com>
Reviewed-on: https://review.whamcloud.com/31503
Tested-by: Jenkins
Reviewed-by: Amir Shehata <ashehata@whamcloud.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Sonia Sharma <sharmaso@whamcloud.com>