ls: long mode format needs additional space when security or FACL symbol is present.

[sgmarz]

The following PR fixes issue #9912.

There is now an added else statement in src/uu/ls/src/ls.rs if neither the security context nor FACL symbols are present to add two spaces instead of just one.

This patch is minimally invasive, however the testing suite was also updated to allow for the . or + symbols as well as a space. Simply, the regex in test_ls.rs was changed from [.+]? to [.+ ]?.

With this PR, the columns now line up properly even when the security context (.) or FACL symbols (+) are present or mixed as demonstrated below:

~> ls_cl_padding/coreutils ls -laF
total 4
drwxr-xr-x   1 root root   34 Dec 29 13:33 ./
drwxr-xr-x  20 root root 4096 Dec 26 12:57 ../
-rw-r--r--   1 root root    0 Dec 29 13:33 abc
drwxrwxr-x+  1 root root  302 Dec 22 20:36 cbin/
-rw-r--r--   1 root root    0 Dec 29 13:33 def
-rw-r--r--   1 root root    0 Dec 29 13:33 ghi
drwxrwxr-x+  1 root root   98 Dec 28 05:54 http/