Support for configurable "hosts"

[Manish Mehra]

Hi,

c-ares provides application to configure resolvconf path. However, no
support exists for configurable “hosts” file for file_lookup function.

Please find attached diff which adds support for ARES_OPT_HOSTS_FILE which
can be set with ares_init_options function.

--
Thanks,
Manish

P.S: Could not create a private branch for pull request. Is there any
policy in place to allow creation of private

# git push origin hosts_path_opt
ERROR: Permission to c-ares/c-ares.git denied to mmehra.
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.
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