os_version: support pattern matching
os_version: support pattern matching

Examples:

# os_version && echo ok
Alpine Linux v3.4 [3.4.0]
ok

# os_version alpine && echo ok
ok

# os_version a && echo ok
ok

# os_version u && echo ok

# os_version 'al*e' && echo ok

# os_version 'al*e*' && echo ok
ok
elifarley/shell-lib