LU-7558 import: don't reconnect during connect interpret

LU-7558 import: don't reconnect during connect interpret

The import connect flags might be cleared by ptlrpc_connect_import()
wrongly if there is still connect interpret function is running.

Use imp_connected boolean variable to indicate that we are still
interpretting connect reply and don't try to reconnect until it ends.

Signed-off-by: Mikhal Pershin <mike.pershin@intel.com>
Change-Id: I77cf70820835dc06b33a75353c8ef71ba4ed4fad
Reviewed-on: http://review.whamcloud.com/19312
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>