oeqa.runtime.smart: work around smart race issues

oeqa.runtime.smart: work around smart race issues

Yucku hack around test failures which ultimately are caused by a race in
smartpm itself. Issuing smartpm commands in quick succession causes
races in package cache of smartpm on some systems. This patch mitigates
the problem by sleeping for 1 second after each smartpm command that
modifies the system.

[YOCTO #10244]

(From OE-Core rev: 4d268abc2fc892c5d34449f78c8e9f2b1a9d6bac)

Signed-off-by: Markus Lehtonen <markus.lehtonen@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>