Filter newer style bash functions out of shell script template's .ins…

[ehealy]

…tall-metadata file.

Exported bash functions take the format of BASH_FUNC_function_name%%. Including them in the .install-metadata file causes export errors, so update the filtering logic to account for them.

[jordansissel]

Code looks ok! I haven't tested, but researching what bash does to export functions shows that this PR looks right.

I tried to find a way to have bash simply unexport all functions, but getting a list of just the exported function names seems difficult to do more easily than you have shown, and as it fits with the existing grep pipeline, this seems ok:)

For posterity, best I could come up with was this one, to unexport any exported functions:

typeset -f +x $(typeset -xfp | sed -ne 's/^declare -fx //p')