Allow clippy option_if_let_else
Allow clippy option_if_let_else

The lint for option_if_let_else that is new for rust 1.47 is giving
suboptimal suggestions.  In one case, it tried to add superfluous
parentheses, and in another, it mixing up an "if let ... else" chain.

Signed-off-by: Bryan Gurney <94498243b15882748b18aec9e6dc02da713818c8@redhat.com>

stratis-storage/stratisd,stratis-storage/stratisd,stratis-storage/stratisd