[Plugin|Policy] Only call lsmod once and standardize kmod checks

This commit makes two changes to how sos deals with kernel modules and
their state during a run of sosreport.

First, no longer call `lsmod` for every individual plugin during its
enablement check. Instead, call `lsmod` only once during `Policy`
initialization, and cache the output for later checks.

Second, have `Plugin.is_module_loaded()` check for kmod presence in the
saved policy class attr for kernel_mods, rather than checking through
`/proc/modules`. Have the plugin enablement checks now also use
`is_module_loaded()` to standardize with how `SoSPredicate`s are
checked.

Note that this change results in a significant performance increase for
sos initialization times in a RHEL 7 container.

Resolves: #1854

Signed-off-by: Jake Hunsaker <jhunsake@redhat.com>

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