aiaiai: fixup srcdir in email and gerrit scripts

aiaiai: fixup srcdir in email and gerrit scripts

$srcdir should represent the current directory where the actual shell
file is located. This requires also updating $PATH so that it points to
the correct directories. This is somewhat confusing since we have to add
'..' to a section, but it fixes the switch to dash check for email
scripts which previously was broken. It also makes everything more
consistent.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>