LU-13569 tests: Check LNet Health recovery logic

LU-13569 tests: Check LNet Health recovery logic

Add test cases to validate LNet Health recovery of local and peer
NIs.

The new test cases are added to the except list for aarch64 due to
an unresolved issue with the LNet drop functionality on that
architecture.

A few style issues are also addressed by this patch.

An asterisk was being supplied to the lctl net_drop_del commands when
this should have been the '-a' flag.

A bug in cleanup_testsuite is addressed where we were using the
wrong filename for the tmp files created by the subtests.

Test-Parameters: trivial testlist=sanity-lnet
HPE-bug-id: LUS-9109
Signed-off-by: Chris Horn <chris.horn@hpe.com>
Change-Id: I965df2449770631caa03ced7726abb0ea76c17e6
Reviewed-on: https://review.whamcloud.com/39723
Reviewed-by: Alexander Boyko <alexander.boyko@hpe.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Serguei Smirnov <ssmirnov@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>