Fix md5sha1sum install

[ariskataoka]

1. The install.sh script, executes brew install for the project dependencies. And it incorrectly adds a blank string before the name of the dependency.

This PR addresses the issue by adding a verification that will only add the blank space when the TMP_INSTALL var contains a value.

2. There's a false negative during the check_utility function execution as well. Functions that exist were pointed out as missing, eg. shasum.

This PR addresses it by checking the utility's existence by verifying the exit codes 127 and 126, which are the ones returned by the OS for non-existent/non-executable commands.

TODO:

• [ X ] Manual testing

[GaryJones]

Is the same fix needed for the wget as well?

[ariskataoka]

Is the same fix needed for the wget as well?

No one has mentioned that, but I'd assume it would be necessary as well. Nice catch!

[ariskataoka]

I've rebased signing and pushing my commits, but it seems GH didn't recognize them. So I've closed the PR, and I'm reopening it now to see if GH recognizes them in this branch.

[wpcomvip-vipgoci-bot]

No issues were found to report when scanning latest commit (commit-ID: 28039283a7fbcf2002497c1020e762bb16ee8d48)

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