Support when value includes '=' character

[sihyeonn]

Since param is splitted by '=' at first, deparam couldn't support base64 encoded value which could have '=' character in it. To solve this problem, when we deal with 'name=value' type, join param with '=' again except the first one, which is a key, and treat them as a value.

Signed-off-by: Sihyeon Jang [email protected]