nyx-modules: Add runtime dependency on gzip

:Release Notes:
Prevent a call to nyx_os_info_query for the kernel configuration from
failing due to the absence of zgrep in non-production images.

:Detailed Notes:
nyx-modules uses zgrep to parse the kernel configuration information.
The absence of an RDEPENDS on gzip (which provides zgrep) meant that,
when another component which did specify the dependency was removed
from the image, the call would fail.

:Testing Performed:
- Ensure zgrep is available in the image
- Run nyx-cmd OSInfo query core_os_kernel_config

:QA Notes:

:Issues Addressed:
[GF-59991] "nyx-cmd OSInfo query" returns error
[GF-60283] CCC: nyx-modules=r11

Open-webOS-DCO-1.0-Signed-off-by: Keith Derrick <keith.derrick@lge.com>
Open-webOS-DCO-1.0-Signed-off-by: Susan Montooth <susan.montooth@lge.com>

Change-Id: I955c594a1b724033b4115e29f7cb97ce332d6b9d
Originally-reviewed-on: https://g2g.palm.com/4642
Cherry-picked-from-commit: 3a43cf1f4446c1b84269cab2008d63ce919a3d81
Cherry-picked-from-branch: @acadia