Report out-of-space, not patch-invalid

If there isn't enough space on the filesystem to upload a patch (which can take
2-3 times the size of the patch, because of multiple copies and gpg signature
checking), we should fail with an Out_of_space exception. Before, if the gpg
check failed because there wasn't enough space to write the unsigned cleartext,
we would erroneously report patch_invalid. Now we check that there is enough
free space to signature check the patch (we make a guess of 2 * size of the
patch), and catch Unix.ENOSPC exceptions and handle them accordingly.

CA-124008

Signed-off-by: Mike McClurg <mike.mcclurg@citrix.com>
Whitespace fix for get_patch_to_local

Signed-off-by: Mike McClurg <mike.mcclurg@citrix.com>
assert_space_available takes optional multiplier arg

Signed-off-by: Mike McClurg <mike.mcclurg@citrix.com>
get_patch_to_local checks filesystem space on slave

Signed-off-by: Mike McClurg <mike.mcclurg@citrix.com>
mkdir -p /var/patch, which might not be there

Signed-off-by: Mike McClurg <mike.mcclurg@citrix.com>
whitespace: spaces to tabs

Signed-off-by: Mike McClurg <mike.mcclurg@citrix.com>
Fix value in warning of space too small to unpack hotfix patch.
Previously the multiplier was not taken into account when reporting
details in the warning message.

Signed-off-by: Thomas Sanders <thomas.sanders@citrix.com>
Merge pull request #1678 from thomassa/ca124008-patch-upload-enospc

Report out-of-space, not patch-invalid